feat(GODT-2801): Identity State Cloning & Auth Check

This patch moves the `user.User.CheckAuth` function into the `State`
type as it contains all the necessary information to perform this check.

A couple of more interfaces are added to abstract the retrieval of the
Bridge and the User's key passwords, as well as telemetry reports.

Finally, adds `State.OnAddressEvents` which other services should use to
update the state.

internal/services/useridentity/auth.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2023 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package useridentity
+
+type KeyPassProvider interface {
+	KeyPass() []byte
+}
+
+type BridgePassProvider interface {
+	BridgePass() []byte
+}