Only write non default values to OpenAPI Json (#2549)

[987Nabil]

Sorted maps for OpenAPI for stable json generation (#2549)

fixes #2549
/claim #2549

[codecov-commenter]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (aecd87c) 65.37% compared to head (b3ffeac) 65.28%.

Files	Patch %	Lines
...main/scala/zio/http/endpoint/openapi/OpenAPI.scala	54.54%	20 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2661      +/-   ##
==========================================
- Coverage   65.37%   65.28%   -0.10%     
==========================================
  Files         144      144              
  Lines        8448     8468      +20     
  Branches     1531     1543      +12     
==========================================
+ Hits         5523     5528       +5     
- Misses       2925     2940      +15     

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