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

extensions/query-store/.eslintrc.json

@@ -0,0 +1,13 @@
+{
+	"parserOptions": {
+		"project": "./extensions/query-store/tsconfig.json"
+	},
+	"rules": {
+		"@typescript-eslint/no-floating-promises": [
+			"error",
+			{
+				"ignoreVoid": true
+			}
+		]
+	}
+}