Includes mmctl into the mono-repo (#23091)

* Includes mmctl into the mono-repo

* Update to use the new public module paths

* Adds docs check to the mmctl CI

* Fix public utils import path

* Tidy up modules

* Fix linter

* Update CI tasks to use the new file structure

* Update CI references

server/cmd/mmctl/mmctl.go

@@ -0,0 +1,18 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package main
+
+import (
+	"os"
+
+	_ "github.com/golang/mock/mockgen/model"
+
+	"github.com/mattermost/mattermost-server/server/v8/cmd/mmctl/commands"
+)
+
+func main() {
+	if err := commands.Run(os.Args[1:]); err != nil {
+		os.Exit(1)
+	}
+}