Endpoint api en-/decodes based on accept header

[987Nabil]

The default codec is still json. Only added support for protobuf and plain text.

fixes #1506
/claim #1506

[codecov-commenter]

Codecov Report

Patch coverage: 61.26% and project coverage change: -0.03% ⚠️

Comparison is base (27289ca) 63.04% compared to head (7a9043f) 63.01%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2366      +/-   ##
==========================================
- Coverage   63.04%   63.01%   -0.03%     
==========================================
  Files         136      137       +1     
  Lines        7035     7101      +66     
  Branches     1242     1257      +15     
==========================================
+ Hits         4435     4475      +40     
- Misses       2600     2626      +26     

Files Changed	Coverage Δ
zio-http/src/main/scala/zio/http/Request.scala	46.15% <0.00%> (-1.22%)	⬇️
...p/src/main/scala/zio/http/codec/HeaderCodecs.scala	95.69% <ø> (ø)
...src/main/scala/zio/http/codec/HttpCodecError.scala	100.00% <ø> (ø)
...main/scala/zio/http/codec/internal/BodyCodec.scala	36.36% <0.00%> (-16.97%)	⬇️
...scala/zio/http/codec/internal/MediaTypeCodec.scala	31.57% <31.57%> (ø)
...n/scala/zio/http/endpoint/EndpointMiddleware.scala	72.91% <57.14%> (-1.51%)	⬇️
...http/src/main/scala/zio/http/codec/HttpCodec.scala	54.37% <88.23%> (+2.69%)	⬆️
...scala/zio/http/codec/internal/EncoderDecoder.scala	94.08% <91.89%> (+9.37%)	⬆️
zio-http/src/main/scala/zio/http/MediaType.scala	96.42% <100.00%> (+0.13%)	⬆️
...o-http/src/main/scala/zio/http/ZClientAspect.scala	66.66% <100.00%> (+2.66%)	⬆️
... and 2 more

... and 2 files with indirect coverage changes

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[jdegoes]

@987Nabil Can you fix conflicts then will be good to merge? 🙏