@spec get_audience(
  Mobilizon.Federation.ActivityPub.Types.Entity.t()
  | Mobilizon.Events.Participant.t()
) ::
  audience()

Get audience for an entity

@spec get_to_and_cc(
  Mobilizon.Actors.Actor.t(),
  list(),
  :direct | :private | :public | :unlisted | {:list, any()}
) :: {list(), list()}

Determines the full audience based on mentions for an audience

For a public audience:

• to : the mentioned actors, the eventual actor we're replying to and the public
• cc : the actor's followers

For an unlisted audience:

• to : the mentioned actors, actor's followers and the eventual actor we're replying to
• cc : public

For a private audience:

• to : the mentioned actors, actor's followers and the eventual actor we're replying to
• cc : none

For a direct audience:

• to : the mentioned actors and the eventual actor we're replying to
• cc : none