Refactor MessengerEnvironment

...XMessengerClient/Messenger/Functors/MessengerCreate.swift

...ssengerClient/Messenger/Functors/MessengerIsCreated.swift

.../XXMessengerClient/Messenger/Functors/MessengerLoad.swift

...XXMessengerClient/Messenger/Functors/MessengerLogIn.swift

...essengerClient/Messenger/Functors/MessengerRegister.swift

...es/XXMessengerClient/Messenger/MessengerEnvironment.swift

...ClientTests/Messenger/Functors/MessengerCreateTests.swift

...entTests/Messenger/Functors/MessengerIsCreatedTests.swift

...erClientTests/Messenger/Functors/MessengerLoadTests.swift

...rClientTests/Messenger/Functors/MessengerLogInTests.swift

...ientTests/Messenger/Functors/MessengerRegisterTests.swift