TF-1915 SendingState of SendingEmail updates according to the work done in WorkManager when network connectivity is restored

(cherry picked from commit 744c8bc8dc8a82cb3afb75aead5a744adaae5501)

lib/features/sending_queue/data/exceptions/sending_queue_exceptions.dart

@@ -0,0 +1,4 @@
+
+class NotFoundSendingEmailHiveObject implements Exception {}
+
+class ExistSendingEmailHiveObject implements Exception {}