Add `rollup-plugin-crx`

[reesericci]

Awesome Contribution Checklist:

• [X] I have read, and re-read the Contributing Guidelines
• [X] I have searched to ensure the suggested item doesn't exist on this list
• [X] This PR contains only one item

Please Provide a Link A Repository for Your Addition

https://codeberg.org/reesericci/rollup-plugin-crx

Please Describe Your Addition

Adds a plugin which generates CRX bundles after a build.