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/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt

@@ -27,7 +27,17 @@ data class RoomMember(
     val powerLevel: Long,
     val normalizedPowerLevel: Long,
     val isIgnored: Boolean,
+    val role: Role,
 ) {
+    /**
+     * Role of the RoomMember, based on its [powerLevel].
+     */
+    enum class Role {
+        ADMIN,
+        MODERATOR,
+        USER
+    }
+
     /**
      * Disambiguated display name for the RoomMember.
      * If the display name is null, the user ID is returned.
@@ -49,6 +59,10 @@ enum class RoomMembershipState {
     LEAVE
 }
 
+/**
+ * Returns the best name value to display for the RoomMember.
+ * If the [RoomMember.displayName] is present and not empty it'll be used, otherwise the [RoomMember.userId] will be used.
+ */
 fun RoomMember.getBestName(): String {
     return displayName?.takeIf { it.isNotEmpty() } ?: userId.value
 }

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/user/MatrixUser.kt

@@ -24,5 +24,5 @@ import kotlinx.parcelize.Parcelize
 data class MatrixUser(
     val userId: UserId,
     val displayName: String? = null,
-    val avatarUrl: String? = null
+    val avatarUrl: String? = null,
 ) : Parcelable