paged route collection

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony-cmf/Routing/pull/108
| License       | MIT
| Doc PR        | n/a
is this comment still relevant? there is no lazy collection *with* paged route provider now (or rather, it makes no difference anymore)