fix: resolve node_modules/package/dir/foo.js if node_modules/package/dir/foo/ exists

[Boshen]

fixes #893
closes #894

PR #839 incorrectly assumed the specifier is always a package name, but a specifier can be package/dir/foo where both node_modules/package/dir/foo.js and node_modules/package/dir/foo/ exists.

[graphite-app]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.39%. Comparing base (a1d806b) to head (8a75edd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #896   +/-   ##
=======================================
  Coverage   94.38%   94.39%           
=======================================
  Files          17       17           
  Lines        3243     3248    +5     
=======================================
+ Hits         3061     3066    +5     
  Misses        182      182           

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[codspeed-hq]

CodSpeed Performance Report

Merging #896 will improve performances by 3.17%

_{Comparing 12-02-fix_resolve_node_modules_package_foo.js_if_node_modules_package_foo__exists (8a75edd) with main (a1d806b)}

Summary

⚡ 1 improvement
✅ 11 untouched
⏩ 5 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	resolver_memory[multi-thread]	483.7 µs	468.9 µs	+3.17%

Footnotes

1. 5 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩