feat(GODT-2802): IMAP Serivce

Handles all IMAP related tasks. Unlike the previous iteration, this new
service automatically adds and removes users from Gluon by interfacing
with server manager.

internal/bridge/events.go

@@ -0,0 +1,35 @@
+// 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 bridge
+
+import (
+	"github.com/ProtonMail/gluon/watcher"
+	"github.com/ProtonMail/proton-bridge/v3/internal/events"
+)
+
+type bridgeEventSubscription struct {
+	b *Bridge
+}
+
+func (b bridgeEventSubscription) Add(ofType ...events.Event) *watcher.Watcher[events.Event] {
+	return b.b.addWatcher(ofType...)
+}
+
+func (b bridgeEventSubscription) Remove(watcher *watcher.Watcher[events.Event]) {
+	b.b.remWatcher(watcher)
+}