add URLSearchParams support

[Monti-27]

Fixes #4743.

Adds URLSearchParams and wires up URL.searchParams.

This also fixes the constructor path for iterable inputs, handles explicit undefined correctly in the two-argument has() and delete() overloads, adds runtime coverage, and re-enables the skipped URL WPT case.

Tests:

• cargo test -p boa_runtime --lib
• cargo test --manifest-path tests/wpt/Cargo.toml url -- --nocapture
• cargo clippy -p boa_runtime --all-features --all-targets -- -D warnings

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	50,073	49,935	-138
Ignored	2,072	2,207	+135
Failed	818	821	+3
Panics	0	0	0
Conformance	94.54%	94.28%	-0.26%

Broken tests (3):

test/intl402/DateTimeFormat/prototype/toStringTag/toStringTag.js (previously Passed)
test/intl402/DateTimeFormat/prototype/toStringTag/toString.js (previously Passed)
test/intl402/Number/prototype/toLocaleString/throws-same-exceptions-as-NumberFormat.js (previously Passed)

Tested main commit: 0698e7063866a1b40be043a1089be43d3224db4b
Tested PR commit: a594311f4748c1f5461953ea54b30877a73f8538
Compare commits: 0698e70...a594311

[Monti-27]

@jedel1043 can you please review this
thank you !!

[Monti-27]

@jedel1043 updated this. searchParams is now created during URL construction and the getter just returns the same object.

[Monti-27]

give me 5 mins I'll clutch this :))

[Monti-27]

also fixed the clippy failure from the missing errors docs on the Rust side URL constructors

[codecov]

Codecov Report

❌ Patch coverage is 92.79279% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.66%. Comparing base (6ddc2b4) to head (fddf67a).
⚠️ Report is 1038 commits behind head on main.

Files with missing lines	Patch %	Lines
core/runtime/src/url.rs	92.72%	24 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5040       +/-   ##
===========================================
+ Coverage   47.24%   62.66%   +15.41%     
===========================================
  Files         476      534       +58     
  Lines       46892    59878    +12986     
===========================================
+ Hits        22154    37521    +15367     
+ Misses      24738    22357     -2381     

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	53,578	53,578	0
Passed	51,326	51,326	0
Ignored	1,748	1,748	0
Failed	504	504	0
Panics	0	0	0
Conformance	95.80%	95.80%	0.00%

Tested main commit: 598d1841b5dd9495ed0375885e36ce4011cf44bb
Tested PR commit: fddf67aab8fce3ebb43474d701a7cf09c31f7191
Compare commits: 598d184...fddf67a

[Monti-27]

@hansl your thoughts on this

[tomasol]

I find this feature very useful. Are there any blockers or can it be merged?

[Monti-27]

@jedel1043 PTAL

[hansl]

This LGTM, @jedel1043 should also do a last pass of review.

[jedel1043]

LGTM

[Monti-27]

this break after v0.22 was released. I’m updating Url to preserve its existing traits, then I’ll rerun the checks