Move plugins out of Ratify main repo

[binbin-li]

What would you like to be added?

Currently plugin codehoused within the Ratify main repo. Adding or updating a plugin requires merging to the main repo and released with Ratify. And projects such as Copa and Notation also maintain separate repos for their plugins.

If we move plugins out of Ratify main repo, we can achieve:

1. Plugins could evolve independently without affecting Ratify main repo.
2. We can reduce dependencies of Ratify projects.
3. [optional] Ratify can easily integrate more external plugins without buidding Ratify image with plugins together.

Anything else you would like to add?

No response

Are you willing to submit PRs to contribute to this feature?

• Yes, I am willing to implement it.