ginjwt/Validate config

[joelrebel]

• Validate multitoken configuration, when creating a new instance, instead of returning as is.
• Validate required Audience, Issuer fields.

This prevents callers from misconfiguring their services, by enforcing the configuration requirements.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 66.92%. Comparing base (6d1c821) to head (252ab4f).

Files	Patch %	Lines
ginjwt/multitokenmiddleware.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   66.92%   66.92%   -0.01%     
==========================================
  Files          17       17              
  Lines        1028     1037       +9     
==========================================
+ Hits          688      694       +6     
- Misses        287      290       +3     
  Partials       53       53              

Flag	Coverage Δ
unittests	66.92% <66.66%> (-0.01%)	⬇️

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