Ability to export assets

[jollytoad]

With the advent of import attributes, it's going to become more common to import arbitrary non-js/ts assets. And it's already possible to resolve relative file/http assets, and use Deno cache-dir to fetch and cache these (eg. from deno.land/x), but jsr doesn't allow you to export them.

Could we have support for exports (or an alternative assets maybe?) in the deno.json or jsr.json to export non-js/ts assets, which can then be fetched from jsr relative to regular modules?