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

Dangerfile.swift

@@ -51,7 +51,8 @@ let allowList = ["stefanceriu",
                  "phlniji",
                  "aringenbach",
                  "flescio",
-                 "Velin92"]
+                 "Velin92",
+                 "alfogrillo"]
 
 let requiresSignOff = !allowList.contains(where: {
     $0.caseInsensitiveCompare(danger.github.pullRequest.user.login) == .orderedSame