Introduce TurboPower::Broadcasts and TurboPower::Broadcastable modules

[marcoroth]

This pull requests introduces the TurboPower::Broadcasts and TurboPower::Broadcastable modules which can be used to broadcast any TurboPower custom action in jobs, controllers, models or whereever you can run Ruby code within your app.

The TurboPower::Broadcasts module provides the broadcast actions in synchronous and asynchronous form for the Turbo::StreamsChannel, meaning an action like console_log can be used like:

Turbo::StreamsChannel.broadcast_console_log_to(:posts, message: "Hello World", level: :info)
Turbo::StreamsChannel.broadcast_console_log_later_to(:posts, message: "Hello World", level: :info)

Which would broadcast the console_log action to any client which is subscribed via:

<%= turbo_stream_from :posts %>

The TurboPower::Broadcastable module allows actions to be broadcasted from ActiveRecord models, like:

# app/models/post.rb

class Post < ApplicationRecord
  after_save do
    # broadcasting to all clients which are subscribed via:
    # <%= turbo_stream_from @post %>
    broadcast_console_log(message: "Hello World", level: "Warn")
    broadcast_console_log_later(message: "Hello World", level: "Warn")

    # broadcasting to all clients which are subscribed via the `:posts` stream identifier:  
    # <%= turbo_stream_from :posts %>
    broadcast_console_log_to(:posts, message: "Hello World", level: "Warn")
    broadcast_console_log_later_to(:posts, message: "Hello World", level: "Warn")
  end
end

[pedraal]

Hi @marcoroth , first of all thanks for your job on this great repo ! Any plan on merging this branch someday ?

[marcoroth]

Hey @pedraal, yes! It's going to happen very soon actually. I wanted to get it merged for Rails World but I didn't manage to. But this is next up