add methods to update the body of a request

[yisraelU]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (93df80a) 64.41% compared to head (b9db842) 64.37%.

Files	Patch %	Lines
zio-http/src/main/scala/zio/http/Request.scala	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2571      +/-   ##
==========================================
- Coverage   64.41%   64.37%   -0.04%     
==========================================
  Files         140      140              
  Lines        8312     8315       +3     
  Branches     1501     1504       +3     
==========================================
- Hits         5354     5353       -1     
- Misses       2958     2962       +4     

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