Bump PHPStan level to 2

[phansys]

Subject

Bump PHPStan level to 2.

I am targeting this branch, because these changes respect BC.

Changelog

### Added
- Missing methods in interfaces (through the `@method` annotation).

### Fixed
- Calls to several undefined methods.

To do

• Validate the changes related to the ODM manager (/cc @franmomu);

[franmomu]

I think this would be something like:

$query = $this->getDocumentManager()->createQueryBuilder();
$query->field('enabled')->equals($criteria['enabled'] ?? true);

$pager = new Pager();
$pager->setMaxPerPage($limit);
$pager->setQuery(new ProxyQuery($query));
// ...

[phansys]

I added a new commit @franmomu: 9b188f5.
Could you please check and confirm if this seems fine to you?
Is there any way this ever worked the way it was written before?
If no, I think we must provide a separate PR for these changes.
Thank you.

[franmomu]

Yeah, this looks fine and I would say it has never worked before, those methods did not exist in the odm 😕

[phansys]

Fixed in #724.
Thank you so much.

[franmomu]

Thanks @phansys !