[WIP] - SWC Plugin Infrastructure, tests and implementation

[spanishpear]

This is a long running, not committed to side-project of creating a rust implementation of the babel plugin for SWC.

Feel free to take the existing work and run with it. I don't fully understand the existing babel plugin, so focusing on a good test setup first so the work is still usable by others if they want to continue on :)

todo:

• run cargo tests through JSX transform first, to match magnetic-di babel tests
• convert babel tests to rust fixtures
• port babel plugin config to a Struct
• consume babel plugin config in swc plugin initialization
• update package json name for swc plugin to be more specific, ready for publish 😆
• add end-to-end tests with real jest config
• Implement transform
  • more to come under here, I'm sure