feat: support decorators in JSX files

[huyingx]

issues: Support decorators in JS files #60

[ArnaudBarre]

Thanks for the PR. But like for decorator metadata, this requires also to run SWC at build time.
I need to decide on a new API to let more flexibility on the SWC configurations while making it more clear when SWC is used for build and when not.

But I'm still unsure with I want to enable this inside this plugin. It would allow/require to name a files .jsx to use decorators even without JSX syntax in there.

[ArnaudBarre]

This will not be supported. See #60 (comment) for more info