Epic: create and join rooms - Start Chat (#680)

* add start chat flow with UI

* add feature flag for start chat

* add changelog

* fix naming and tests

* fix empty display name in user cell

* Update ElementX/Sources/Application/AppSettings.swift

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

* add screenshots from UI test

* fix swiftFormat and add identifiers

* fix warnings

---------

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

UITests/Sources/StartChatScreenUITests.swift

@@ -0,0 +1,25 @@
+//
+// Copyright 2022 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 ElementX
+import XCTest
+
+class StartChatScreenUITests: XCTestCase {
+    func testStartChatScreen() {
+        let app = Application.launch(.startChat)
+        app.assertScreenshot(.startChat)
+    }
+}

UITests/Sources/__Snapshots__/Application/de-DE-iPad-9th-generation.startChat.png

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UITests/Sources/__Snapshots__/Application/de-DE-iPhone-14.startChat.png

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UITests/Sources/__Snapshots__/Application/en-GB-iPad-9th-generation.startChat.png

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UITests/Sources/__Snapshots__/Application/en-GB-iPhone-14.startChat.png

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