feat: google analytics (#15451)

* wip backend

* wip frontend

* build misskey-js

* implement control panel

* fix

* introduce analytics wrapper

* spdx

* Update analytics.ts

* Update common.ts

* wip

* wip

* wip

* wip

* wip

* Update CHANGELOG.md

---------

Co-authored-by: kakkokari-gtyih <67428053+kakkokari-gtyih@users.noreply.github.com>

packages/backend/src/models/Meta.ts

@@ -658,4 +658,10 @@ export class MiMeta {
 		default: '{}',
 	})
 	public federationHosts: string[];
+
+	@Column('varchar', {
+		length: 64,
+		nullable: true,
+	})
+	public googleAnalyticsMeasurementId: string | null;
 }