sourcing maxInitialLineLength through the config and propagating it to netty's configuration

[hdriviere]

Resolve #2560

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f42676e) 64.76% compared to head (725ded7) 64.73%.

Files	Patch %	Lines
zio-http/src/main/scala/zio/http/Server.scala	0.00%	1 Missing ⚠️
zio-http/src/main/scala/zio/http/ZClient.scala	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2561      +/-   ##
==========================================
- Coverage   64.76%   64.73%   -0.03%     
==========================================
  Files         139      139              
  Lines        8128     8130       +2     
  Branches     1481     1488       +7     
==========================================
- Hits         5264     5263       -1     
- Misses       2864     2867       +3     

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