feat: support `doctrine/orm` 3

[kbond]

trafficstars

TODO:

• [ ] sqlite changes. We don't currently test but there are some breaking changes when using ResetDatabase with sqlite

[nikophil]

won't it be a PITA to maintain tests for both versions?

[kbond]

Possibly, but if we bump the min orm to latest 2.x, perhaps it won't be a problem?

[kbond]

I think some of the work done in https://github.com/symfony/maker-bundle/pull/1439 could help us here.

[jrushlow]

MakeTestRunner::configureDatabase() has the logic we needed to get sqlite to work with the new orm - https://github.com/symfony/maker-bundle/blob/d9574302ee67c23ae5c803556f2b779c3b0b94a2/src/Test/MakerTestRunner.php#L156

[nikophil]

closed in favor of https://github.com/zenstruck/foundry/pull/569