feat(verify2): adding cancel method

[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)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

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

[codecov-commenter]

Codecov Report

Merging #824 (e177f4b) into 3.x (3e04e19) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.x     #824      +/-   ##
==========================================
+ Coverage   79.58%   79.66%   +0.08%     
==========================================
  Files          99       99              
  Lines        1259     1264       +5     
  Branches      252      252              
==========================================
+ Hits         1002     1007       +5     
  Misses        256      256              
  Partials        1        1              

Impacted Files	Coverage Δ
packages/verify2/lib/verify2.ts	100.00% <100.00%> (ø)

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