feat: support customize Rules types via generic

[antfu]

https://github.com/antfu/eslint-define-config#2-allow-overriding-rules

[Shinigami92]

I like the Strict extends boolean = false of this PR, but I would like not to have this dedicated to Rules as well es FlatConfig

Right now defineConfig is mostly meant to be used in .js files which do not have great/easy generic TS support
I would suggest to make it possible to call the method like so:

module.exports = defineConfig(config, { strict: true })
// or
module.exports = defineConfig(config, { strict: ['rules', 'settings'] })

Then the generic is inferred from that

We can also introduce a breaking change and make strict: true the default, so folks need to use strict: false if they want to add arbitrary config values

[Shinigami92]

the work for the augmented global properties support is done
you can now work on this again
I would like to have this in v2.0.0 release before moving out of beta
if you cant work on this in the next 30 days, please let me know