feat: added verifySignature to jwt package

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #860 (064aaf3) into 3.x (f974dd6) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.x     #860      +/-   ##
==========================================
+ Coverage   84.16%   84.25%   +0.08%     
==========================================
  Files         120      120              
  Lines        1554     1562       +8     
  Branches      300      300              
==========================================
+ Hits         1308     1316       +8     
  Misses        245      245              
  Partials        1        1              

Files Changed	Coverage Δ
packages/jwt/lib/index.ts	100.00% <100.00%> (ø)
packages/jwt/lib/jwt.ts	100.00% <100.00%> (ø)

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