Sort the room member list and display member roles (#2412)

* Sort the room member list and display member roles

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/RoomMemberFixture.kt

@@ -29,6 +29,7 @@ fun aRoomMember(
     powerLevel: Long = 0L,
     normalizedPowerLevel: Long = 0L,
     isIgnored: Boolean = false,
+    role: RoomMember.Role = RoomMember.Role.USER,
 ) = RoomMember(
     userId = userId,
     displayName = displayName,
@@ -38,4 +39,5 @@ fun aRoomMember(
     powerLevel = powerLevel,
     normalizedPowerLevel = normalizedPowerLevel,
     isIgnored = isIgnored,
+    role = role,
 )