feat: add mongocli plugin (#9248)

plugins/mongocli/README.md

+# mongocli plugin
+
+The plugin adds several aliases for common [mongocli](https://docs.mongodb.com/mongocli/stable/) commands.
+
+To use it, add `mongocli` to the plugins array of your zshrc file:
+
+```zsh
+plugins=(... mongocli)
+```
+
+## Aliases
+
+| Alias    | Command                                                     | Description                                            |
+|----------|-------------------------------------------------------------|--------------------------------------------------------|
+| `ma`     | `mongocli atlas`                                            | Shortcut for mongocli Atlas commands.                  |
+| `mcm`    | `mongocli cloud-manager`                                    | Shortcut for mongocli Cloud Manager commands.          |
+| `mom`    | `mongocli ops-manager`                                      | Shortcut for mongocli Cloud Manager commands.          |
+| `miam`   | `mongocli iam`                                              | Shortcut for mongocli IAM commands.                    |
+

plugins/mongocli/mongocli.plugin.zsh

+alias ma='mongocli atlas'
+alias mcm='mongocli cloud-manager'
+alias mom='mongocli ops-manager'
+alias miam='mongocli iam'