Add modern configuration for template light and switch (#38332)

source/_integrations/template.markdown

@@ -50,12 +50,14 @@ For other types, please see the specific pages:
 - [Alarm control panel](/integrations/alarm_control_panel.template/)
 - [Cover](/integrations/cover.template/)
 - [Fan](/integrations/fan.template/)
-- [Light](/integrations/light.template/)
 - [Lock](/integrations/lock.template/)
-- [Switch](/integrations/switch.template/)
 - [Vacuum](/integrations/vacuum.template/)
 - [Weather](/integrations/weather.template/)
 
+For Legacy types, please see the specific pages:
+- [Light](/integrations/light.template/)
+- [Switch](/integrations/switch.template/)
+
 {% include integrations/config_flow.md %}
 
 {% important %}
@@ -74,7 +76,7 @@ Entities (sensors, binary sensors, buttons, images, numbers, and selections) are
 
 _For old sensor/binary sensor configuration format, [see below](#legacy-binary-sensor-configuration-format)._
 
-### State-based template binary sensors, buttons, images, numbers, selects, sensors, and weathers
+### State-based template binary sensors, buttons, images, lights, numbers, selects, sensors, switches, and weathers
 
 Template entities will by default update as soon as any of the referenced data in the template updates.
 
@@ -307,6 +309,125 @@ image:
       required: false
       type: boolean
       default: true
+light:
+  description: List of your lights.
+  required: true
+  type: map
+  keys:
+    state:
+      description: Defines a template to set the state of the light. If not defined, the switch will optimistically assume all commands are successful.
+      required: false
+      type: template
+      default: optimistic
+    level:
+      description: Defines a template to get the brightness of the light.
+      required: false
+      type: template
+      default: optimistic
+    temperature:
+      description: Defines a template to get the color temperature of the light.
+      required: false
+      type: template
+      default: optimistic
+    hs:
+      description: Defines a template to get the HS color of the light. Must render a tuple (hue, saturation).
+      required: false
+      type: template
+      default: optimistic
+    rgb:
+      description: Defines a template to get the RGB color of the light. Must render a tuple or a list (red, green, blue).
+      required: false
+      type: template
+      default: optimistic
+    rgbw:
+      description: Defines a template to get the RGBW color of the light. Must render a tuple or a list (red, green, blue, white).
+      required: false
+      type: template
+      default: optimistic
+    rgbww:
+      description: Defines a template to get the RGBWW color of the light. Must render a tuple or a list (red, green, blue, cold white, warm white).
+      required: false
+      type: template
+      default: optimistic
+    supports_transition:
+      description: Defines a template to get if the light supports transition. Should return a boolean value (True/False). If this value is `True`, the transition parameter in a `turn on` or `turn off` call will be passed as a named parameter `transition` in either of the scripts.
+      required: false
+      type: template
+      default: false
+    effect_list:
+      description: Defines a template to get the list of supported effects. Must render a list.
+      required: inclusive
+      type: template
+      default: optimistic
+    effect:
+      description: Defines a template to get the effect of the light.
+      required: inclusive
+      type: template
+      default: optimistic
+    min_mireds:
+      description: Defines a template to get the minimum mired value of the light.
+      required: false
+      type: template
+      default: optimistic
+    max_mireds:
+      description: Defines a template to get the maximum mired value of the light.
+      required: false
+      type: template
+      default: optimistic
+    turn_on:
+      description: Defines an action to run when the light is turned on. May receive the variables `brightness` and/or `transition`.
+      required: true
+      type: action
+    turn_off:
+      description: Defines an action to run when the light is turned off. May receive the variable `transition`.
+      required: true
+      type: action
+    set_level:
+      description: Defines an action to run when the light is given a brightness command. The script will only be called if the `turn_on` call only ha brightness, and optionally transition. Receives variables `brightness` and, optionally, `transition`.
+      required: false
+      type: action
+    set_temperature:
+      description: Defines an action to run when the light is given a color temperature command. Receives variable `color_temp`. May also receive variables `brightness`  and/or `transition`.
+      required: false
+      type: action
+    set_hs:
+      description: "Defines an action to run when the light is given a hs color command. Available variables: `hs` as a tuple, `h` and `s`"
+      required: false
+      type: action
+    set_rgb:
+      description: "Defines an action to run when the light is given an RGB color command. Available variables: `rgb` as a tuple, `r`, `g` and `b`."
+      required: false
+      type: action
+    set_rgbw:
+      description: "Defines an action to run when the light is given an RGBW color command. Available variables: `rgbw` as a tuple, `rgb` as a tuple, `r`, `g`, `b`  and `w`."
+      required: false
+      type: action
+    set_rgbww:
+      description: "Defines an action to run when the light is given an RGBWW color command. Available variables: `rgbww` as a tuple, `rgb` as a tuple, `r`, `g`  `b`, `cw` and `ww`."
+      required: false
+      type: action
+    set_effect:
+      description: Defines an action to run when the light is given an effect command. Receives the variable `effect`. May also receive the variables `brightness`, and/or  `transition`.
+      required: inclusive
+      type: action
+switch:
+  description: List of switches
+  required: true
+  type: map
+  keys:
+    state:
+      description: Defines a template to set the state of the switch. If not defined, the switch will optimistically assume all commands are successful.
+      required: false
+      type: template
+      default: optimistic
+    turn_on:
+      description: Defines an action or list of actions to run when the switch is turned on.
+      required: true
+      type: action
+    turn_off:
+      description: Defines an action or list of actions to run when the switch is turned off.
+      required: true
+      type: action
 weather:
   description: List of weather entities
   required: true
@@ -392,7 +513,7 @@ weather:
       description: Unit for precipitation output. Valid options are km, mi, ft, m, cm, mm, in, yd.
       required: false
       type: string
-"[all sensor, binary sensor, button, image, number, select, weather entities]":
+"[all sensor, binary sensor, button, image, light, number, select, switch, weather entities]":
   description: Fields that can be used above for sensors, binary sensors, buttons, numbers, and selects.
   required: false
   type: map