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/docs/mmctl_config_subpath.rst

@@ -0,0 +1,60 @@
+.. _mmctl_config_subpath:
+
+mmctl config subpath
+--------------------
+
+Update client asset loading to use the configured subpath
+
+Synopsis
+~~~~~~~~
+
+
+Update the hard-coded production client asset paths to take into account Mattermost running on a subpath. This command needs access to the Mattermost assets directory to be able to rewrite the paths.
+
+::
+
+  mmctl config subpath [flags]
+
+Examples
+~~~~~~~~
+
+::
+
+    # you can rewrite the assets to use a subpath
+    mmctl config subpath --assets-dir /opt/mattermost/client --path /mattermost
+
+    # the subpath can have multiple steps
+    mmctl config subpath --assets-dir /opt/mattermost/client --path /my/custom/subpath
+
+    # or you can fallback to the root path passing /
+    mmctl config subpath --assets-dir /opt/mattermost/client --path /
+
+Options
+~~~~~~~
+
+::
+
+  -a, --assets-dir string   directory of the Mattermost assets in the local filesystem
+  -h, --help                help for subpath
+  -p, --path string         path to update the assets with
+
+Options inherited from parent commands
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+      --config string                path to the configuration file (default "$XDG_CONFIG_HOME/mmctl/config")
+      --disable-pager                disables paged output
+      --insecure-sha1-intermediate   allows to use insecure TLS protocols, such as SHA-1
+      --insecure-tls-version         allows to use TLS versions 1.0 and 1.1
+      --json                         the output format will be in json format
+      --local                        allows communicating with the server through a unix socket
+      --quiet                        prevent mmctl to generate output for the commands
+      --strict                       will only run commands if the mmctl version matches the server one
+      --suppress-warnings            disables printing warning messages
+
+SEE ALSO
+~~~~~~~~
+
+* `mmctl config <mmctl_config.rst>`_ 	 - Configuration
+