feat: Adds eslint for ts and js files

[tuliomir]

Acceptance Criteria

• Adds eslint configuration for all of the project code
• Adds scripts on the package.json for easy linting, formatting and error fixing

Notes

A .eslintrc file already existed in the repository and was being used to lint the integration test files. The rules on this file were preserved, and it was only moved to a js structure for improved maintenance convenience.

A newer major version of Eslint is available, but has some incompatibilities with some of our other dependencies. This is being tracked by:

• Upgrade Eslint to v9 #661

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.73%. Comparing base (28e5ff2) to head (2146330).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #669       +/-   ##
===========================================
+ Coverage   62.79%   79.73%   +16.93%     
===========================================
  Files          77       77               
  Lines        5886     5886               
  Branches     1242     1242               
===========================================
+ Hits         3696     4693      +997     
+ Misses       2094     1176      -918     
+ Partials       96       17       -79     

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