Support non-JS exports #31
Description
When building a library designed to be used in a bundler with asset importing, it's sometimes convenient to create entrypoints for particular library assets, like import 'my-lib/main.css';. I'm not sure if this is recommended, but it is perfectly doable with package.exports by simply pointing to the asset file location.
Since zshy takes over the exports field it would be nice for it to detect non-.[mc][tj]s export values and write them as-is.
Example
Given the config:
"zshy": {
".": "./src/index.ts",
"./main.css": "./assets/main.css"
}zshy writes the following:
"exports": {
".": {
"types": "./dist/index.d.cts",
"import": "./dist/index.js",
"require": "./dist/index.cjs"
},
"./main.css": "./assets/main.css"
}