feat(GODT-2814): Standalone Server Manager

Convert ServerManger into a standalone service so that it can become a
self contained module.

internal/bridge/events.go

@@ -18,6 +18,8 @@
 package bridge
 
 import (
+	"context"
+
 	"github.com/ProtonMail/gluon/watcher"
 	"github.com/ProtonMail/proton-bridge/v3/internal/events"
 )
@@ -33,3 +35,11 @@ func (b bridgeEventSubscription) Add(ofType ...events.Event) *watcher.Watcher[ev
 func (b bridgeEventSubscription) Remove(watcher *watcher.Watcher[events.Event]) {
 	b.b.remWatcher(watcher)
 }
+
+type bridgeEventPublisher struct {
+	b *Bridge
+}
+
+func (b bridgeEventPublisher) PublishEvent(_ context.Context, event events.Event) {
+	b.b.publish(event)
+}