Initial commit for Query Store extension (#23260)

* Initial commit for Query Store extension

* fix eslint explicit-functino-return-type setting

* address comments

* remove specifying explicit-function-return-type eslint rule

* update strings

build/lib/extensions.js

@@ -274,6 +274,7 @@ const externalExtensions = [
     'machine-learning',
     'profiler',
     'query-history',
+    'query-store',
     'schema-compare',
     'server-report',
     'sql-assessment',

build/lib/extensions.ts

@@ -310,6 +310,7 @@ const externalExtensions = [
 	'machine-learning',
 	'profiler',
 	'query-history',
+	'query-store',
 	'schema-compare',
 	'server-report',
 	'sql-assessment',