Support Percent Encoded Paths

[swhitty]

Adds support for parsing requests with percent encoded paths.

Routes can be added including spaces:

server.appendRoute("/fish & chips") { _ in
  HTTPResponse(
    statusCode: .ok,
    headers: [.contentType: "text/plain; charset=UTF-8"],
    body: "🐟🍟".data(using: .utf8)!
  )
}

Requests are decoded and matched against the unescaped Routes:

% curl "localhost/fish%20&%20chips"
🐟🍟

Resolves #74

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (148e228) 99.77% compared to head (d8fac8f) 99.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          47       47           
  Lines        2675     2684    +9     
=======================================
+ Hits         2669     2678    +9     
  Misses          6        6           

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