Add support for parcel

[Ayc0]

Parcel is another well used bundler

[Ayc0]

For now blocked by parcel-bundler/parcel#7922

Also the current loader for the v1 doesn't support custom options, so maybe the next one won't either

[Ayc0]

Parcel added support for MDX 2+ in their newest versions (see parcel-bundler/parcel#10064). But they depend on mdx-rs which doesn't allow plugins. So we can't use that with Parcel OOTB

Or it'll need a custom plugin. For later