Add Voice and Video call in room header (#11444)
* Add Voice and Video call in room header
* Add thread icon in room header
* Add room notification icon to room header
* Fix linting
* Add tests for buttons in room header
* Add JSDoc
* micro optimisations
* Fix call disabled when hanging up
* Fix disabled state change on members count update
* Exclude functional members from members count optionally
* i18n
