Checking the configuration in a dedicated script instead of at runtime

[Pierre-Sassoulas]

Current problem

We're doing some "complicated" check all the time for example here: #8411

But it could be done once in a dedicated script instead.

Desired solution

No check at runtime but a possibility to validate the configuration. Maybe a better validation of the configuration. Or maybe not, this is not what is taking most of the time in pylint and maybe this will make the user experience worst for almost no benefit.

Additional context

#8411

[DanielNoord]

THis should probably just be part of pylint-config