feat: cleanup main types

[MichaelDeBoey]

Follow-up of #1667

CC/ @G-Rath @mskelton

[G-Rath]

I don't really see this as strictly better - the types as they are pretty straightforward and maintainable as they are imo, and I in particular like having the configs written out individually to make it clear what is available without having to mentally unroll some type logic.

At the very least, this is not a "feat" or a "fix"

[mskelton]

I would agree with @G-Rath on this not necessarily improving the types greatly.

[MichaelDeBoey]

@G-Rath @mskelton We're also using TSESLint's types here, which is a dependency we already have

If we use ESLint's dependency, we would need to add @types/eslint to the dependencies in package.json to work correctly

[G-Rath]

@MichaelDeBoey you'll already need @types/eslint as a dependency if you're type-checking eslint.config.js on v8, and ESLint v9 ships with its own types that are compatible with these ones, so that shouldn't be an issue