ZClient fast shutdown

[johnhungerford]

Added shutdownQuietPeriodDuration and shutdownTimeOutDuration to NettyConfig allowing users to customize the shutdown behavior of netty's EventLoopGroup.

Added defaultWithFastShutdown version of NettyConfig to be used by ClientConfig.default. Quiet period for this default is 50 ms and timeout is at 250 ms.

Added tests confirming that client cleanup takes no more than 250 ms and that a user can increase the quiet period.

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[codecov-commenter]

Codecov Report

Patch coverage: 35.00% and project coverage change: +0.01% 🎉

Comparison is base (ca6513f) 63.41% compared to head (3fe2a23) 63.43%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2410      +/-   ##
==========================================
+ Coverage   63.41%   63.43%   +0.01%     
==========================================
  Files         137      137              
  Lines        7113     7116       +3     
  Branches     1259     1260       +1     
==========================================
+ Hits         4511     4514       +3     
  Misses       2602     2602              

Files Changed	Coverage Δ
zio-http/src/main/scala/zio/http/ZClient.scala	42.75% <ø> (ø)
...rc/main/scala/zio/http/netty/EventLoopGroups.scala	33.33% <23.52%> (ø)
...tp/src/main/scala/zio/http/netty/NettyConfig.scala	60.00% <100.00%> (+17.14%)	⬆️

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