Refactor the JoinRoom screen to take advantage of newer APIs and support more joinRule/membership combinations (i.e. invite required, restricted, banned) (#3685)

- expose the full RoomPreview and RoomMembershipDetails through their own proxies
- implement standard mocks for all the different combinations
- converge on a single room info provider
- rebuild all the previews
- prioritise the preview data over the room one.

ElementX/Sources/Services/Room/RoomPreview/RoomPreviewProxyProtocol.swift

@@ -0,0 +1,14 @@
+//
+// Copyright 2024 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+
+// sourcery: AutoMockable
+protocol RoomPreviewProxyProtocol {
+    var info: RoomPreviewInfoProxy { get }
+    var ownMembershipDetails: RoomMembershipDetailsProxyProtocol? { get async }
+}