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/commands/version.go

@@ -0,0 +1,64 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package commands
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost-server/server/v8/cmd/mmctl/printer"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	Version = model.CurrentVersion
+	// SHA1 from git, output of $(git rev-parse HEAD)
+	gitCommit = "dev mode"
+	// State of git tree, either "clean" or "dirty"
+	gitTreeState = "unknown"
+	// Build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
+	buildDate = "unknown"
+)
+
+var VersionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Prints the version of mmctl.",
+	RunE:  versionCmdF,
+}
+
+func init() {
+	RootCmd.AddCommand(VersionCmd)
+}
+
+func versionCmdF(cmd *cobra.Command, args []string) error {
+	v := getVersionInfo()
+	printer.PrintT("mmctl:\nVersion:\t{{.Version}}\nGitCommit:\t{{.GitCommit}}"+
+		"\nGitTreeState:\t{{.GitTreeState}}\nBuildDate:\t{{.BuildDate}}\nGoVersion:\t{{.GoVersion}}"+
+		"\nCompiler:\t{{.Compiler}}\nPlatform:\t{{.Platform}}", v)
+	return nil
+}
+
+type Info struct {
+	Version      string
+	GitCommit    string
+	GitTreeState string
+	BuildDate    string
+	GoVersion    string
+	Compiler     string
+	Platform     string
+}
+
+func getVersionInfo() Info {
+	return Info{
+		Version:      Version,
+		GitCommit:    gitCommit,
+		GitTreeState: gitTreeState,
+		BuildDate:    buildDate,
+		GoVersion:    runtime.Version(),
+		Compiler:     runtime.Compiler,
+		Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}