Add Flat Config Compatibility

[Kenneth-Sills]

Migrated from upstream issue.

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Eslint announced a new config spec.
eslint.org/docs/latest/user-guide/configuring/configuration-files-new

According to eslint's official blog, though backward compatibility was taken care of, not all shareable configs continue to work with the new config system.

Are eslint-config-airbnb-typescript and eslint-config-airbnb-typescript/base compatible with the new config?

Thanks.

[github-actions]

🎉 This issue has been resolved in version 19.0.0 🎉

The release is available on:

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

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