[FEATURE] Move rules to dedicated directory

[sabbelasichon]

No description provided.

[andreaswolf]

Looks good so far, I would just add a more expressive API for adding a rule – services->set() is fine for people who know Symfony DI, but if you never used it in detail, that's just confusing. But maybe that's a good second step after this PR.

[sabbelasichon]

Looks good so far, I would just add a more expressive API for adding a rule – services->set() is fine for people who know Symfony DI, but if you never used it in detail, that's just confusing. But maybe that's a good second step after this PR.

I know. We should definitely improve it in the future.