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/utils/hash.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package utils
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+func HashSha256(text string) string {
+	hash := sha256.New()
+	hash.Write([]byte(text))
+
+	return fmt.Sprintf("%x", hash.Sum(nil))
+}