This commit implements drafts for threads by adding a new `thread_id` column to `chat_drafts` table. This column is used to create draft keys on the frontend which are a compound key of the channel and the thread. If the draft is only for the channel, the key will be `c-${channelId}`, if for a thread: `c-${channelId}:t-${threadId}`.
This commit also moves the draft holder from the service to the channel or thread model. The current draft can now always be accessed by doing: `channel.draft` or `thread.draft`.
Other notable changes of this commit:
- moves ChatChannel to gjs
- moves ChatThread to gjs
This commit attempts to correctly change draft when the channel changes. It moves responsibility to the composer instead of the channel.
A new service `chatDraftsManager` is being introduced here to allow finer control and pave the way for future thread draft support.
These changes also now allow an editing message to be stored as a draft.