break(url): handle decodes correctly; trim ParsedURL properties

[lukeed]

Took the opportunity to make it a breaking change:

• removed useless keys on ParsedURL interface
• use named parse export instead of default function

Technically, this means it's a breaking change for Polka too. Specifically, the req.url is no longer fully decoded.
Now, req.url is the decoded req.path segment concatenated with the NOT-decoded req.search segment. Before this change, the req.url was comprised of a decoded req.search segment too... which often caused problems in userland.

The raw, fully-encoded value is always still available as req.originalUrl ... unless you change it.

Lastly, revamped the @polka/url benchmarks and it looks like it got a bit of a speed boost too 🚀

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Closes #150

[codecov-commenter]

Codecov Report

Merging #165 (8e45667) into next (de206c3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              next      #165   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          117       108    -9     
=========================================
- Hits           117       108    -9     

Impacted Files	Coverage Δ
packages/polka/index.js	100.00% <100.00%> (ø)
packages/url/index.js	100.00% <100.00%> (ø)

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