Extract notification actions from `MastodonAPIController` into `NotificationController`
See merge request pleroma/pleroma!1646
alias Pleroma.Bookmark
alias Pleroma.Config
alias Pleroma.Conversation.Participation
+ alias Pleroma.Emoji
alias Pleroma.Filter
- alias Pleroma.Formatter
alias Pleroma.HTTP
- alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Pagination
alias Pleroma.Plugs.RateLimiter