feat: add posix and win32 exports to match node:path

[xeho91]

Resolves #192

[xeho91]

By the way, the same solution can be used for path.posix, but I don't know anyone ever encountered a problem with some package trying to access this export - when using pathe as fallback for "node:path".

EDIT. Oh wow, I had this issue 😅 , when re-testing.

Since pathe internally already does normalization. We can refer posix and win32 to path namespace. I think. Let me know if this solution is applicable.

[pi0]

I appreciate the PR ❤️ Updated types to be more precise with runtime behavior.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.31%. Comparing base (bdab761) to head (730852d).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
- Coverage   99.45%   99.31%   -0.14%     
==========================================
  Files           4        4              
  Lines         364      292      -72     
  Branches      114      119       +5     
==========================================
- Hits          362      290      -72     
  Misses          2        2              

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[pi0]

(This will likely land for path v2)