fix(o2k): request-validator support +json suffix for schemas

[vm-001]

#174

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 67.76%. Comparing base (8ffe079) to head (adda33f).
Report is 2 commits behind head on main.

Files	Patch %	Lines
openapi2kong/validator.go	54.54%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   67.79%   67.76%   -0.04%     
==========================================
  Files          23       23              
  Lines        2481     2491      +10     
==========================================
+ Hits         1682     1688       +6     
- Misses        641      643       +2     
- Partials      158      160       +2     

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[Tieske]

do not panic here, this is a library and it shouldn't bail out but return the error.

Imho 2 options:

1. use logbasics and log a message at Info level that the mediatype found is invalid and will be ignored
2. bubble up the error to the caller.

[Tieske]

fyi in the entire library, only the Must... methods/functions will ever panic. everything else will return an error.

[vm-001]

This sounds good to me. I print an Info log when the mediatype failed to be parsed