外部サービス認証情報の配信 (#3975)

* Update person.ts

* Update person.ts

* Update person.ts

* Update person.ts

* Create original model

* Make type formal

* Update person.ts

* Follow @mei23's review

refs: https://github.com/syuilo/misskey/pull/3975#pullrequestreview-195770172

src/remote/activitypub/models/identifier.ts

@@ -0,0 +1,5 @@
+export type IIdentifier = {
+	type: string;
+	name: string;
+	value: string;
+};