Support returning body from another request

[andrzejressel]

I guess handling of AsyncBody was incorrent?

Fixes #2157
/claim #2157

[ex0ns]

I have tested this on the code I submitted in the issue and it now works as expected

[codecov-commenter]

Codecov Report

Patch coverage: 75.00% and project coverage change: +0.29 🎉

Comparison is base (b406af8) 66.81% compared to head (a60ff8a) 67.10%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2161      +/-   ##
==========================================
+ Coverage   66.81%   67.10%   +0.29%     
==========================================
  Files         141      142       +1     
  Lines        6011     6196     +185     
  Branches      232      265      +33     
==========================================
+ Hits         4016     4158     +142     
- Misses       1995     2038      +43     

Impacted Files	Coverage Δ
...rc/main/scala/zio/http/netty/NettyBodyWriter.scala	59.25% <75.00%> (+19.25%)	⬆️

... and 46 files with indirect coverage changes

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[jdegoes]

Thanks for your contribution!