Allen Porter 0991a30125
Pre-factor nest subscriber to library (#59462)
* Pre-factor nest subscriber to library

Move the nest subscriber to a library that can be reused in a future PR:
- From ConfigFlow for creating subscriptions
- On nest removal to delete subscriptions

This is pulled out of PR #59260 to make that easier to review.

* Resolve pylint error in nest api subscriber

* Remove duplicate constants
2021-11-14 16:08:22 -08:00
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