fix(path): support Node.js

[dsherret]

Prefers using the process global since it exists on all runtimes, then falls back to the Deno global.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.61%. Comparing base (f318978) to head (44a9640).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
path/_common/env.ts	50.00%	2 Missing and 2 partials ⚠️
path/windows/resolve.ts	60.00%	2 Missing ⚠️
internal/_os.ts	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7103      +/-   ##
==========================================
+ Coverage   94.59%   94.61%   +0.01%     
==========================================
  Files         632      633       +1     
  Lines       51780    51777       -3     
  Branches     9324     9324              
==========================================
+ Hits        48981    48987       +6     
+ Misses       2225     2216       -9     
  Partials      574      574              

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