Group channels will allow users to create channels with a name and invite people. It's possible to add people even after creation of the channel. Removing users is not yet possible but will be added in the near future.
Technically a group channel is `direct_message_channel` with a group attribute set to true on its direct message (chatable). This model might evolve in the future but offers much flexibility for now without having to rely on a complex migration.
The commit essentially consists of:
- a migration to set existing direct message channels with more than 2 users to a group
- a new message creator which allows to search, add members, and create groups
- a new `AddUsersToChannel` service
- a modified `SearchChatable` service
This PR is a first step towards private groups. It redesigns settings/members area of a channel and also drops the "about" page which is now mixed into settings.
This commit is also:
- introducing chat-form, a small DSL to create forms, ideally I would want something in core for this
- introducing a DToggleSwitch page object component to simplify testing toggles
- migrating various components to gjs
