chore(linter): Add more tests for ESLintConfig

[leaysgur]

Before trying #2258 , I'd like to prevent regression. 🦺

Overview

• Rename ESLintConfig::new(path) -> from_file(path)
• Split from_file() implementation into 2 parts
  • Parse path, strip json comment, check .json ext part
  • from_value(): Read +parse JSON contents part
    • ☝🏻used in tests
• Add tests for parsing rules, settings, env

TODOs found, for next PR

• rules parser should handle "no-debugger": 1 form
• settings.xxx_components should go under settings.react.

Notes

• rules's type
  • https://github.com/eslint/eslint/blob/main/lib/shared/types.js#L12
• settings's type is Object 😅
  • https://github.com/eslint/eslint/blob/main/lib/shared/types.js#L53
  • and its usage is extended by each plugin
    • https://github.com/jsx-eslint/eslint-plugin-react?tab=readme-ov-file#configuration-legacy-eslintrc-
    • https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/?tab=readme-ov-file#configurations
    • https://nextjs.org/docs/pages/building-your-application/configuring/eslint#eslint-plugin
• env's type is just a Record<string, boolean>
  • https://github.com/eslint/eslint/blob/main/lib/shared/types.js#L40

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[codspeed-hq]

CodSpeed Performance Report

Merging #2284 will not alter performance

_{Comparing issue_2258-pre (9411ac2) with main (41d1876)}

Summary

✅ 27 untouched benchmarks

[Boshen]

Thank you so much for working on this, I hope you enjoyed some Rust :-)