feat: add config for Svelte

[nostrorom]

Checks

• I have read the contributing guidelines.

Changes

• Adds recommended config for svelte
• Updates the Linter.FlatConfig type (deprecated)

Context

Adds to #80

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (93a6ab9) to head (26d360e).
Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #973      +/-   ##
==========================================
+ Coverage   96.23%   96.27%   +0.04%     
==========================================
  Files          44       46       +2     
  Lines        2419     2472      +53     
  Branches     1000     1025      +25     
==========================================
+ Hits         2328     2380      +52     
- Misses         91       92       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Belco90]

Hey @nostrorom! Thanks for your contribution, this LGTM.

[github-actions]

🎉 This PR is included in version 7.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[Belco90]

@all-contributors please add @nostrorom for code

[allcontributors]

@Belco90

I've put up a pull request to add @nostrorom! 🎉

[G-Rath]

note that these types should not have been changed - while Linter.FlatConfig is marked as deprecated in v9, it's the correct type to be using for v8 since Linter.Config there resolves to the legacy configuration.

For plugins like this which support both v8 and v9, we should be using the explicit Linter.LegacyConfig and Linter.FlatConfig types to ensure users of both receive the right types.

I have opened #976 to revert this change

[nostrorom]

Indeed I didn't realise these were necessary for v8 compatibility

Thanks for the fix !