Finish extraction

- Moves SwiftUI code out of Riot and into RiotSwiftUI which has no dependency on Matrix SDK.
- Git wasn't smart enough to see the file moves. Most feature function has remain unchanged. 1 change I did make was remove NotificationSettingsViewModel's dependence on MxPushRule, so that the view model could be moved into RiotSwiftUI.
- Add LocaleProvider to abstract VectorL10n's use of Matrix SDK language so it can be used in RiotSwiftUI.
- Split Theme into UKit/SwiftUI version to remove RiotSwiftUI's dependence on ThemeService and ThemeV1.
- Migrated from ThemeObserver to ThemePublisher. We push updates to ThemePublisher so that we can remove ThemeService as dependency.
- Add .DS_Store to .gitignore

RiotSwiftUI/Modules/Settings/Notifications/Mock/MockNotificationPusRule.swift

@@ -0,0 +1,25 @@
+// 
+// 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
+
+struct MockNotificationPushRule: NotificationPushRule {
+    var ruleId: String!
+    var enabled: Bool
+    func matches(standardActions: NotificationStandardActions?) -> Bool {
+        return false
+    }
+}

RiotSwiftUI/Modules/Settings/Notifications/Mock/MockNotificationSettingsService.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 Combine
+
+@available(iOS 14.0, *)
+class MockNotificationSettingsService: NotificationSettingsServiceType, ObservableObject {
+    static let example = MockNotificationSettingsService()
+    
+    @Published var keywords = Set<String>()
+    @Published var rules = [NotificationPushRule]()
+    @Published var contentRules = [NotificationPushRule]()
+    
+    var contentRulesPublisher: AnyPublisher<[NotificationPushRule], Never> {
+        $contentRules.eraseToAnyPublisher()
+    }
+    
+    var keywordsPublisher: AnyPublisher<Set<String>, Never> {
+        $keywords.eraseToAnyPublisher()
+    }
+    
+    var rulesPublisher: AnyPublisher<[NotificationPushRule], Never> {
+        $rules.eraseToAnyPublisher()
+    }
+    
+    func add(keyword: String, enabled: Bool) {
+        keywords.insert(keyword)
+    }
+    
+    func remove(keyword: String) {
+        keywords.remove(keyword)
+    }
+    
+    func updatePushRuleActions(for ruleId: String, enabled: Bool, actions: NotificationActions?) {
+        
+    }
+}