Add a priority attribute on doctrine.middleware tag and #[AsMiddleware] attribute

[Okhoshi]

Currently, the ordering of the middlewares is only driven by the order in which they were registered in the container, which is not very predictable and sometimes impossible to modify (if one middleware is injected by another bundle for instance). By setting the priority on the doctrine.middleware tag, this ordering can be modified more easily.

[dmaicher]

From my side 👍 for that feature. I will also let @ostrolucky have a look.

For finalizing it I think we should also document it in https://github.com/doctrine/DoctrineBundle/blob/2.11.x/Resources/doc/middlewares.rst

[dmaicher]

I might also be able to leverage that here 😄

https://github.com/dmaicher/doctrine-test-bundle/blob/master/src/DAMA/DoctrineTestBundle/DependencyInjection/DoctrineTestCompilerPass.php#L81

[Okhoshi]

I might also be able to leverage that here 😄

https://github.com/dmaicher/doctrine-test-bundle/blob/master/src/DAMA/DoctrineTestBundle/DependencyInjection/DoctrineTestCompilerPass.php#L81

Happy to see it might be useful immediately 🎉

For finalizing it I think we should also document it in https://github.com/doctrine/DoctrineBundle/blob/2.11.x/Resources/doc/middlewares.rst

Adding it now 👍

[ostrolucky]

Looks ok, but please also document it