Add RoomTimelineCellProviderProtocol that enables to register and provide room timeline cells.

Riot/Modules/Room/Views/BubbleCells/Styles/RoomTimelineCellProviderProtocol.h

@@ -0,0 +1,36 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#import <UIKit/UIKit.h>
+
+#import "RoomTimelineCellIdentifier.h"
+#import "MXKCellRendering.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// Enables to register and provide room timeline cells
+@protocol RoomTimelineCellProviderProtocol <NSObject>
+
+/// Register timeline cells for the given table view
+- (void)registerCellsForTableView:(UITableView*)tableView;
+
+/// Get timeline cell class from cell identifier
+- (Class<MXKCellRendering>)cellViewClassForCellIdentifier:(RoomTimelineCellIdentifier)identifier;
+
+@end
+
+NS_ASSUME_NONNULL_END
+