Support multiple query values with same key

[adam-fowler]

Add FlatDictionary to store query values, which supports storing multiple values for the same key. Use this in HBParameters.

[codecov]

Codecov Report

Base: 78.50% // Head: 78.15% // Decreases project coverage by -0.35% ⚠️

Coverage data is based on head (55b01fc) compared to base (fc53436).
Patch coverage: 56.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   78.50%   78.15%   -0.36%     
==========================================
  Files          71       72       +1     
  Lines        3038     3094      +56     
==========================================
+ Hits         2385     2418      +33     
- Misses        653      676      +23     

Impacted Files	Coverage Δ
Sources/Hummingbird/Router/Parameters.swift	51.35% <27.27%> (-9.37%)	⬇️
Sources/Hummingbird/HTTP/URL.swift	84.78% <50.00%> (+1.08%)	⬆️
Sources/Hummingbird/Utils/FlatDictionary.swift	63.82% <63.82%> (ø)

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[drekka]

Looks good to me :-)

[adam-fowler]

Did a quick performance test and it is slower accessing values than a standard Dictionary, but much quicker setting values than a standard Dictionary

[drekka]

Given that there's only ever a few parameters I'd be surprised it mattered :-)