Start location sharing screen: Add LocationSharingService.

RiotSwiftUI/Modules/Room/LocationSharing/Service/MatrixSDK/LocationSharingService.swift

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+// 
+// 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 Foundation
+import CoreLocation
+import MatrixSDK
+
+class LocationSharingService: LocationSharingServiceProtocol {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let userLocationService: UserLocationServiceProtocol?
+    
+    // MARK: Public
+    
+    // MARK: - Setup
+    
+    init(userLocationService: UserLocationServiceProtocol?) {
+        self.userLocationService = userLocationService
+    }
+    
+    // MARK: - Public
+    
+    func requestAuthorization(_ handler: @escaping LocationAuthorizationHandler) {
+        guard let userLocationService = self.userLocationService else {
+            handler(LocationAuthorizationStatus.unknown)
+            return
+        }
+        
+        userLocationService.requestAuthorization(handler)
+    }
+}