Max streamed upload configuration value

[adam-fowler]

maxUploadSize does not provide enough control over how much data should be uploaded. Routes that stream data require a much larger upload size limit as you are limiting how much data can be uploaded, while routes that collate the request body into one ByteBuffer require a smaller one as you are limiting how much memory you can hold in memory at any one time.

With this in mind this PR adds an additional maxStreamedUploadSize value to the application config. This value is probably the equivalent of the original maxUploadSize and is passed down to the server. The maxUploadSize is now used to limit the size of a ByteBuffer that can be collated from a stream.

[github-actions]

Pull request benchmark comparison [ubuntu-latest] with 'main' run at 2023-03-23T14:04:36+00:00

[codecov]

Codecov Report

Patch coverage: 50.61% and project coverage change: -0.29 ⚠️

Comparison is base (69189d3) 84.21% compared to head (b23efe3) 83.92%.

❗ Current head b23efe3 differs from pull request most recent head f09e67b. Consider uploading reports for the commit f09e67b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
- Coverage   84.21%   83.92%   -0.29%     
==========================================
  Files          77       77              
  Lines        4351     4517     +166     
==========================================
+ Hits         3664     3791     +127     
- Misses        687      726      +39     

Impacted Files	Coverage Δ
...s/Hummingbird/AsyncAwaitSupport/Router+async.swift	57.44% <0.00%> (-3.92%)	⬇️
Sources/Hummingbird/Configuration.swift	45.94% <41.37%> (-26.89%)	⬇️
Sources/Hummingbird/Server/Request.swift	86.74% <81.81%> (-7.78%)	⬇️
Sources/Hummingbird/Router/RouterMethods.swift	94.95% <100.00%> (+0.26%)	⬆️

... and 3 files with indirect coverage changes

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