new: Add groundwork for plugins. (#1273)

* Start on plugin crates.

* Start mapping stuff.

* Fixes.

* Clean up components.

* More work.

* Start on command.

* Add configs.

* More plugin work.

* Support configs.

* Split from workspace.

* Add default configs.

* Update tests.

* Update.

* Just use clap.

* Get exts working.

* Fix deps.

* Polish.

* Fix lockfile.

* Add tests.

* Add test utils.

CONTRIBUTING.md

@@ -32,8 +32,14 @@ just build
 ### Node.js
 
 Contributing to our `@moonrepo` npm packages requires Node.js and Yarn. We suggest
-[installing Node.js with nvm](https://github.com/nvm-sh/nvm), and Yarn can later be installed with
-`npm install -g yarn`.
+[installing both with proto](https://moonrepo.dev/proto).
+
+```bash
+proto install node
+proto install yarn
+# or
+proto use
+```
 
 Once setup, install dependencies build initial packages.