feat: use json-schema-tools validator instead of ajv

[shanejonas]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 75.00%. Comparing base (850fc80) to head (2bc9fd1).

Files	Patch %	Lines
src/coverage.ts	33.33%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #469       +/-   ##
===========================================
- Coverage   88.37%   75.00%   -13.38%     
===========================================
  Files           1        1               
  Lines          43       44        +1     
  Branches        9       10        +1     
===========================================
- Hits           38       33        -5     
- Misses          5       11        +6     

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