Allow custom room URLs

[tibroc]

Is your feature request related to a problem? Please describe.
Currently the room urls can only be the automatically created ids, like in pilos-instance.com/rooms/hke-9cp-5z2

Describe the solution you'd like
It would be nice to be able to have custom urls that can be more easily memorized by users, like e.g. pilos-instance.com/rooms/my-weekly.

Describe alternatives you've considered
None, really.

[samuelwei]

How to implement

• Increase DB column size id in rooms table: create migration
• Add new option allow_custom_id to room_types: create migration, adjust controller, request validation, api ressource, frontend, tests
• Add text input to create room dialog if the selected room type allow_custom_id attr. is true
• Validate id request field to be null or unique
• Validate if selected room_type allow_custom_id and is set, use string as id
• Add frontend tests
• Add backend tests

[samuelwei]

https://laravel-news.com/laravel-model-tips#content-using-uuids