fix(eslint-config): replace gts with prettier and eslint

[samimusallam]

Fixes #1433

Short description of the changes

• Replaced the gts module with Prettier.
• Also using the following configuration for eslint: eslint:recommended, plugin:@typescript-eslint/recommended, plugin:prettier/recommended to match the core repo's configuration.

[Flarna]

Some rules here differ from core repo. Is this intended to keep the changeset small?

[samimusallam]

True, but I wasn't sure if there were rules (eg: the import rule) that were added for a specific reason in this repo.
I would prefer to have no differences between the two repos.

[samimusallam]

I've updated the eslint.config file to match the core repo's configuration as close as possible.
The following is the difference between this and core to prevent eslint errors in existing code:

• eqeqeq set to off instead of ["error", "smart"]
• removed "no-console": "error"
• removed "@typescript-eslint/no-floating-promises": "error"
• added "@typescript-eslint/no-var-requires": "off"
• removed "@typescript-eslint/no-unused-vars": ["error", {"argsIgnorePattern": "^_", "args": "after-used"}]

Let me know if it makes sense to re-add/remove these rules which will require some code changes in multiple packages in the repo.

[Flarna]

I think that's fine as a first step but we should aim to get in sync soon via some followup PRs. Best one by one to keep changesets small and easy/fast reviewed.
In special disabling eqeqeq and no-console allows code patterns we usually don't want.

[codecov]

Codecov Report

Merging #1439 (c58acf5) into main (2d8e2b8) will decrease coverage by 2.63%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1439      +/-   ##
==========================================
- Coverage   96.13%   93.51%   -2.63%     
==========================================
  Files          14      111      +97     
  Lines         906     5010    +4104     
  Branches      197      923     +726     
==========================================
+ Hits          871     4685    +3814     
- Misses         35      325     +290     

see 97 files with indirect coverage changes