Migration upgrade (V3): addition of RolePermissions, RoomSettings,...

Migration upgrade (V3): addition of RolePermissions, RoomSettings, SharedAccess, SiteSettings, RoomConfiguration data (#4378)

* Add RoomMeetingOption endpoint

* Improve RoomMeetingOption endpoint

* Add return error

* Put RoomMeetingOption logic back into Room endpoint

* Rubocop

* Add SharedAccess

* Add SharedAccess to Room

* Fix SiteSettings

* Fix SharedAccess

* Improve comments

* Add RoomsConfigurations

* Improve Rooms query - or not

* Rename SiteSettings migration to Settings

* Improve Role query

* Small fix to Role endpoint

* fix: rename site_settings to settings in routes

* Fix specs

* Rubocop

* Rework endpoints so that it updates all the join table records in one query

* Rubocop

* Rework SharedAccess so all records are created in one query

* Fix data structure, use transform_values instead of map

* Rubocop