fix(js): closer compliance for url js intrinsic

[sgammon]

• fix: make port return null if no port is declared
• test: add initial wpt tests for url intrinsic

[codecov]

Codecov Report

Merging #314 (653339b) into v3 (ff4ba6c) will decrease coverage by 0.04%.
The diff coverage is 78.12%.

@@            Coverage Diff             @@
##               v3     #314      +/-   ##
==========================================
- Coverage   53.81%   53.78%   -0.04%     
==========================================
  Files         260      260              
  Lines        8824     8821       -3     
  Branches     1260     1259       -1     
==========================================
- Hits         4749     4744       -5     
- Misses       3679     3687       +8     
+ Partials      396      390       -6     

Flag	Coverage Δ
jvm	53.78% <78.12%> (-0.04%)	⬇️
lib	55.22% <78.12%> (-0.04%)	⬇️
substrate	0.00% <ø> (ø)

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Files Changed	Coverage Δ
...me/gvm/internals/intrinsics/js/url/URLIntrinsic.kt	91.19% <78.12%> (+0.44%)	⬆️

... and 3 files with indirect coverage changes

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