Support "Create=>Image" activity

Expected behavior

Support of the ActivityStreams "Create=>Image" activity

Actual behavior

No support

Steps to reproduce the problem

Add a new ActivityPub contact (Bob) and follow him

From Bob account, create a "Create=>Image" activity (for instance from Hubzilla)

Except to see this activity on your pleroma stream

See the bug in Mastodon (which was fixed) : https://github.com/tootsuite/mastodon/issues/11137

See the bug in MissKey (which was fixed) : https://github.com/syuilo/misskey/issues/5768

Thanks.