modify entrypoints.ts to handle wildcards in package.json export node…

[sagrimson]

… recursively

Changes

This PR addresses the issue described here: #3867
The current function only returns paths to modules that are in the top level of the directory, but it should return all files in the subdirectories according to this: https://nodejs.org/api/packages.html#subpath-patterns. To fix this, I modified the function forEachWildcardEntry() to yield files in subdirectories.

Testing

I tested this in my local environment and can now import modules that are in subdirectories of wildcard entries of the export field of the package.json

Docs

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[vvaradarajan]

Great work..Has this been released? I downloaded [snowpack] 3.8.8, and found that files in the 'subdirectories' were not being 'exported'. My use-case is the @Shoelace components. The issue is:
./node_modules/@shoelace-style/shoelace/package.json ## location of package.json
..
"./dist/components/*": "./dist/components/*" ## Line in exports section. However this line was not sufficient to export './dist/components/carousel/carousel.js'
Adding the line below to explicitly import from the subdirectory (carousel) works..
"./dist/components/carousel/*": "./dist/components/carousel/*"