SNOW-933278: Add camelCase, eqeqeq and no-sync rules for eslint

[sfc-gh-dprzybysz]

Description

• Add camelCase, eqeqeq and no-sync rules for eslint
• Add samples to the directories to lint
• Add script showing only lint errors

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

Merging #662 (6e081f1) into master (2e711fd) will decrease coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #662      +/-   ##
==========================================
- Coverage   87.90%   87.54%   -0.36%     
==========================================
  Files          60       60              
  Lines        5590     5590              
==========================================
- Hits         4914     4894      -20     
- Misses        676      696      +20     

see 6 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more