Initial migration to new ESLint flat config format

[emmenko]

Note

This is an exploratory branch to attempt the migration of the ESLint configs to the new ESLint flat config format.
This is not ready for review yet.

ESLint has been working on a major refactoring of their config format which they call "flat" (or simply "new config").

I believe this will be the default format from version 9 onwards, however we can already opt into it.

I also found this article doing a good job in explaining the differences and how you can migrate the config piece-by-piece.

If someone has time and wants to explore this, let's use this branch.

• Migrate repository ESLint config
• Migrate eslint-config-mc-app (will it be a breaking change or can we be backwards compatible?)

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Latest commit: cf58278

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