[Message Actions] Report messages (#642)

* Add report messages feature

* Try to improve how snackbars are delivered

---------

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

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

@@ -76,6 +76,7 @@ class FakeMatrixRoom(
     private var retrySendMessageResult = Result.success(Unit)
     private var cancelSendResult = Result.success(Unit)
     private var forwardEventResult = Result.success(Unit)
+    private var reportContentResult = Result.success(Unit)
 
     var sendMediaCount = 0
         private set
@@ -89,6 +90,9 @@ class FakeMatrixRoom(
     var cancelSendCount: Int = 0
         private set
 
+    var reportedContentCount: Int = 0
+        private set
+
     var isInviteAccepted: Boolean = false
         private set
 
@@ -249,6 +253,15 @@ class FakeMatrixRoom(
         setTopicResult
     }
 
+    override suspend fun reportContent(
+        eventId: EventId,
+        reason: String,
+        blockUserId: UserId?
+    ): Result<Unit> = simulateLongTask {
+        reportedContentCount++
+        return reportContentResult
+    }
+
     override fun close() = Unit
 
     fun givenLeaveRoomError(throwable: Throwable?) {
@@ -338,4 +351,8 @@ class FakeMatrixRoom(
     fun givenForwardEventResult(result: Result<Unit>) {
         forwardEventResult = result
     }
+
+    fun givenReportContentResult(result: Result<Unit>) {
+        reportContentResult = result
+    }
 }