feat: add TypeScript IntelliSense support with eslint-typegen

[2nofa11]

Summary

Add TypeScript IntelliSense support via eslint-typegen with ESM migration for ESLint v9.0+ compatibility.

Changes

• Integrate eslint-typegen for TypeScript definitions
• Convert eslint.config.js to eslint.config.mjs (required for eslint-typegen)
• Install with --legacy-peer-deps due to ESLint version requirements
• Update all imports to ESM format

Benefits

• TypeScript IntelliSense for ESLint configurations
• Modern ESLint v9.0+ compatibility
• Improved developer experience with type safety

Screenshot

Before(No TypeScript Support)	After(TypeScript IntelliSense Active)

close #2757

[changeset-bot]

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Latest commit: 73d68c9

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[FloEdelmann]

Please update to ESLint v9 in the dev dependencies, so we don't need to use --legacy-peer-deps. This would also fix the Netlify deployment that is currently failing due to that peer dependency mismatch.

Updating that version is irrelevant for users of this package, as ESLint v8 is still supported as a peer dependency. We also run the tests in the CI with ESLint v8, so everything is well tested.