feat: account migration (#10507)

* add Move activity

* add endpoint to move from local to remote

* follow move activity coming to inbox

* fix move endpoint

* add known-as endpoint to create account alias

* add migration page

* add route to migration page

* add move and known-as endpoints

* fix dependnecies error

* fix new endpoints

* fix move activity id

* fix refollow

* add movedToUri and alsoKnownAs to api

* fix moveToUri indicator

* fix missing context

* add chengelog

* rename MkMoved to MkAccountMoved

* add missing semicolon

* fix targetUri

* fix followings query

* remove redundant null check

locales/en-US.yml

@@ -988,6 +988,16 @@ enableChartsForFederatedInstances: "Generate remote instance data charts"
 showClipButtonInNoteFooter: "Add \"Clip\" to note action menu"
 largeNoteReactions: "Enlargen displayed reactions"
 noteIdOrUrl: "Note ID or URL"
+migration: "Migration"
+moveTo: "Move current account to new account"
+moveToLabel: "Account you're moving to:"
+moveAccountDescription: "This process is irreversible. Make sure you've set up an alias for this account on your new account before moving. Please enter the tag of the account formatted like @person@instance.com"
+moveFrom: "Move to this account from an older account"
+moveFromLabel: "Account you're moving from:"
+moveFromDescription: "This will set an alias of your old account so that you can move from that account to this current one. Do this BEFORE moving from your older account. Please enter the tag of the account formatted like @person@instance.com"
+migrationConfirm: "Are you absolutely sure you want to migrate your acccount to {account}? Once you do this, you won't be able to reverse it, and you won't be able to use your account normally again.\nAlso, please ensure that you've set this current account as the account you're moving from."
+accountMoved: "User has moved to a new account:"
+
 _achievements:
   earnedAt: "Unlocked at"
   _types:
@@ -1898,4 +1908,3 @@ _webhookSettings:
     renote: "When renoted"
     reaction: "When receiving a reaction"
     mention: "When being mentioned"
-