perf: remove heap allocation in parse_query

[dsherret]

Also updates parse_fragment to work similarly to how parse_query works now where it operates on longer string slices for percent decoding, which helps to not have to do that for every character.

Before:

test long           ... bench:         302 ns/iter (+/- 42) = 142 MB/s
test fragment       ... bench:         370 ns/iter (+/- 9) = 140 MB/s

After:

test long           ... bench:         243 ns/iter (+/- 7) = 176 MB/s
test fragment       ... bench:         275 ns/iter (+/- 9) = 189 MB/s

[codecov]

Codecov Report

Attention: Patch coverage is 75.71429% with 17 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@ffca1ef). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
url/src/parser.rs	75.71%	17 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1020   +/-   ##
=======================================
  Coverage        ?   80.22%           
=======================================
  Files           ?       24           
  Lines           ?     4258           
  Branches        ?        0           
=======================================
  Hits            ?     3416           
  Misses          ?      842           
  Partials        ?        0           

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[lucacasonato]

Great!

[lucacasonato]

LGTM, thanks!