Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/wsapi/api.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package wsapi
+
+import (
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/platform"
+)
+
+type API struct {
+	App    *app.App
+	Router *platform.WebSocketRouter
+}
+
+func Init(s *app.Server) {
+	a := app.New(app.ServerConnector(s.Channels()))
+	router := s.Platform().WebSocketRouter
+	api := &API{
+		App:    a,
+		Router: router,
+	}
+
+	api.InitUser()
+	api.InitSystem()
+	api.InitStatus()
+}