Get the default sketchbook path from backend

Signed-off-by: jbicker <jan.bicker@typefox.io>

arduino-ide-extension/src/common/protocol/config-service.ts

@@ -0,0 +1,12 @@
+
+export const ConfigServicePath = '/services/config-service';
+export const ConfigService = Symbol('ConfigService');
+
+export interface ConfigService {
+    getConfiguration(): Promise<Config>;
+}
+
+export interface Config {
+    sketchDirPath: string;
+    dataDirPath: string;
+}