This feature adds the functionality to start a new chat directly from the URL using query params.
The format is: /chat/new-message?recipients=buford,jona
The initial version of this feature allows for the following:
- Open an existing direct message channel with a single user
- Create a new direct message channel with a single user (and auto redirect)
- Create or open a channel with multiple users (and auto redirect)
- Redirects to chat home if the recipients param is missing
