add remote session sequence to prevent stale state updates (#3390)

* add remote session sequence to prevent stale state updates

* remote RHStateKey

* add StateSeq check to controller

* clean up

* simplify

* undo withRemoteXSession API change

* simplify

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/Chat/Remote/Types.hs

@@ -56,6 +56,8 @@ data RemoteSignatures
       sessPubKey :: C.PublicKeyEd25519
     }
 
+type SessionSeq = Int
+
 data RHPendingSession = RHPendingSession
   { rhKey :: RHKey,
     rchClient :: RCHostClient,