Enhancement: Show members of a space

A new option to view all members of a space has been added to the bottom sheet, available when the three-dot menu button is tapped.
This new option opens a new view that shows information like member names, roles, and expiration dates (if available).

https://github.com/owncloud/android/issues/4612
https://github.com/owncloud/android/issues/4763
https://github.com/owncloud/android/issues/4772
https://github.com/owncloud/android/issues/4782
https://github.com/owncloud/android/pull/4728
https://github.com/owncloud/android/pull/4765
https://github.com/owncloud/android/pull/4779
https://github.com/owncloud/android/pull/4784
https://github.com/owncloud/android/pull/4809
https://github.com/owncloud/android/pull/4841
