Add JWKS parameters for verifying web token signatures

[michael-doubez]

Activate verification of token signature. Fix #89

Testing done

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1. Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!

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[codecov]

Codecov Report

Attention: Patch coverage is 67.24138% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 73.27%. Comparing base (c3d9244) to head (9442607).
Report is 12 commits behind head on master.

Files	Patch %	Lines
...va/org/jenkinsci/plugins/oic/OicSecurityRealm.java	57.89%	10 Missing and 6 partials ⚠️
...jenkinsci/plugins/oic/OicJsonWebTokenVerifier.java	85.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #297      +/-   ##
============================================
+ Coverage     73.16%   73.27%   +0.11%     
- Complexity      189      209      +20     
============================================
  Files             9       10       +1     
  Lines           775      872      +97     
  Branches        113      123      +10     
============================================
+ Hits            567      639      +72     
- Misses          151      170      +19     
- Partials         57       63       +6     

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