JWT detect improvement

[babenek]

Description

Please include a summary of the change and which is fixed.

based on #468

• Reviewed rules which may be a JWT - applied url-safe pattern
• Separated decode_base64 with padding detection and urlsafe

How has this been tested?

Please describe the tests that you ran to verify your changes.

• UnitTest
• Benchmark

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (75f7803) 90.83% compared to head (03c6b3d) 90.82%.

Files	Patch %	Lines
credsweeper/utils/util.py	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #454      +/-   ##
==========================================
- Coverage   90.83%   90.82%   -0.02%     
==========================================
  Files         123      123              
  Lines        4169     4175       +6     
  Branches      658      660       +2     
==========================================
+ Hits         3787     3792       +5     
  Misses        252      252              
- Partials      130      131       +1     

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