Refactor controllers for statuses, accounts, and more (#11249)

app/controllers/remote_follow_controller.rb

app/controllers/statuses_controller.rb

app/controllers/tags_controller.rb

app/controllers/well_known/host_meta_controller.rb

app/controllers/well_known/webfinger_controller.rb

app/lib/activitypub/activity/announce.rb

app/lib/activitypub/activity/create.rb

app/lib/activitypub/activity/delete.rb

app/lib/activitypub/tag_manager.rb

app/models/status.rb

app/serializers/activitypub/activity_serializer.rb

app/serializers/activitypub/actor_serializer.rb

app/serializers/activitypub/collection_serializer.rb

app/serializers/activitypub/emoji_serializer.rb

app/serializers/activitypub/note_serializer.rb

app/services/process_hashtags_service.rb

app/views/statuses/_simple_status.html.haml

config/routes.rb

spec/controllers/concerns/account_controller_concern_spec.rb

spec/controllers/statuses_controller_spec.rb