Add user search for dm chats (#739)

* Add searchUsers in ClientProxy

* Add UserSearchProtocol

* Delete UserSearch file

* Add search

* Refine StartChatScreen

* Improve StartChatViewModel

* Add localizations

* Fix no result style

* Update localizations

* Add UTs

* Add UI tests

* Cleanup

* Refine tests

* Add changelog.d file

* Naming refactor

* Refactor ClientProxyProtocol api

* Fix typo

* Add mark

* Rename tests

* Update Dangerfile

* Improve UI test code

* Refactor search api

* Improve style

* Improve combine chain

* Add comment

* Improve StartChatScreen

* Improve updateState

* Add extension Published.Publisher

* Improve UI tests

* Remove Combine import

* Cleanup

* Remove “proxy” wording

* Delete extra extensions

* Refactor Publisher api

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -31,6 +31,7 @@ enum ClientProxyError: Error {
     case failedSettingAccountData
     case failedRetrievingSessionVerificationController
     case failedLoadingMedia
+    case failedSearchingUsers
 }
 
 enum SlidingSyncConstants {
@@ -91,4 +92,6 @@ protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
     func logout() async
 
     func setPusher(with configuration: PusherConfiguration) async throws
+    
+    func searchUsers(searchTerm: String, limit: UInt) async -> Result<SearchUsersResults, ClientProxyError>
 }