Support accept Header & Use RequestBody

[Nerzal]

Describe the PR
The current V2 branch parses RequestBody parameters into the parameter object and always defaults to application/json in requestBodies.

With this pullRequest we are aware of accept headers and use the correct mimeType in the RequestBody for the most common mimeTypes.

Relation issue
Implement #1540

Additional context
In the future we should deprecate the use of the param comment for the body and create a new // @requestBody comment type to support all available fields

[codecov]

Codecov Report

Patch coverage: 87.75% and project coverage change: -0.15 ⚠️

Comparison is base (677b4c2) 77.80% compared to head (4e397c9) 77.66%.

❗ Current head 4e397c9 differs from pull request most recent head 69f4e5c. Consider uploading reports for the commit 69f4e5c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #1541      +/-   ##
==========================================
- Coverage   77.80%   77.66%   -0.15%     
==========================================
  Files          21       21              
  Lines        5415     5488      +73     
==========================================
+ Hits         4213     4262      +49     
- Misses       1026     1044      +18     
- Partials      176      182       +6     

Impacted Files	Coverage Δ
operationv3.go	83.59% <87.75%> (-2.13%)	⬇️

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