Changes

GoTrue

• Add role parameter to AdminUserUpdateBuilder
• Add Fly OAuthProvider

Realtime

• Add the ability to broadcast messages to a Realtime Channel without being connected to the websocket (via an API endpoint)

  val channel = client.realtime.createChannel("id")
  channel.broadcast("messages", Message("test"))

• Optimize Realtime implementation

Postgrest

• Restructure Postgrest implementation and add unit tests (#277 by @hieuwu)