Set a default power level to join calls in room (#1927)

* Set a default power level to join calls.

Also, create new rooms taking this power level into account.

* Modify test to make sure we display the disabled state even when there is an ongoing call

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

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

@@ -132,6 +132,8 @@ interface MatrixRoom : Closeable {
 
     suspend fun canUserTriggerRoomNotification(userId: UserId): Result<Boolean>
 
+    suspend fun canUserJoinCall(userId: UserId): Result<Boolean>
+
     suspend fun updateAvatar(mimeType: String, data: ByteArray): Result<Unit>
 
     suspend fun removeAvatar(): Result<Unit>