Parse followers audience from followers URI (#7112)

* add followersUri

* add followersUri to audience parse

* fetch followersUri

* followersUri db migration

* update followersUri

* Rename 1611354329133-followersUri to 1611354329133-followersUri.ts

* typo

* Update person.ts

* create/update person consistency

* Update audience.ts

* missing paren

* tabs

* use strict equality

* Update audience.ts

src/models/entities/user.ts

@@ -201,6 +201,12 @@ export class User {
 	})
 	public uri: string | null;
 
+	@Column('varchar', {
+		length: 512, nullable: true,
+		comment: 'The URI of the user Follower Collection. It will be null if the origin of the user is local.'
+	})
+	public followersUri: string | null;
+
 	@Index({ unique: true })
 	@Column('char', {
 		length: 16, nullable: true, unique: true,