Add methods to Endpoint to apply any kind of in/out codec

[987Nabil]

• add some convenience methods for creating header codecs
• make text codecs implicit for easy usage in header and query codec

[codecov-commenter]

Codecov Report

Patch coverage: 63.63% and project coverage change: +0.15 🎉

Comparison is base (237861e) 66.71% compared to head (2fd8680) 66.87%.

❗ Current head 2fd8680 differs from pull request most recent head a933181. Consider uploading reports for the commit a933181 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2142      +/-   ##
==========================================
+ Coverage   66.71%   66.87%   +0.15%     
==========================================
  Files         141      141              
  Lines        6033     6040       +7     
  Branches      257      256       -1     
==========================================
+ Hits         4025     4039      +14     
+ Misses       2008     2001       -7     

Impacted Files	Coverage Δ
...tp/src/main/scala/zio/http/codec/QueryCodecs.scala	50.00% <ø> (+25.00%)	⬆️
...p/src/main/scala/zio/http/codec/HeaderCodecs.scala	95.69% <20.00%> (-4.31%)	⬇️
...http/src/main/scala/zio/http/codec/TextCodec.scala	77.96% <100.00%> (+6.77%)	⬆️
...tp/src/main/scala/zio/http/endpoint/Endpoint.scala	31.00% <100.00%> (+1.40%)	⬆️

... and 2 files with indirect coverage changes

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[jdegoes]

Thank you for your work on this!