EntityGenerator lifecycle callbacks

[timum-viw]

This PR addresses a problem in the Entity Generator. when adding the same lifecycle event callback to two or more lifecycle events the generator will create a stub for each event each with the same method name. This results in fatal 'Cannot redeclare' errors. This Problem occurred only if the callback name contains uppercase letters.

this PR intends to fix this issue by updating the EntityGenerator to allow the same callback to be triggered by multiple event.

[greg0ire]

It seems there are CI jobs failing. Please take a look at this guide for more on how to handle those.

[timum-viw]

Sorry about that. I fixed the formatting according to phpcs output and locally no errors in the changed files are reported.

[greg0ire]

Please kindly squash your commits together. If you don't, we'll try to remember to do it for you but it's best if you save us this trouble.

How to do that?

1. git rebase -i origin/2.20.x, assuming origin is a git remote that points to this repository, and not your fork. If you're not sure what your remotes are, run git remote -vvv, there should be your fork and the holy/reference/base/origin/whatever-you-call-it repository.
2. A window will show up with many lines, replace pick with fixup on every line but the first one
3. Close your editor, git should do its magic, and you should end up with one commit
4. Use git push --force to overwrite what you already push. Don't forget the --force option otherwise git will try to merge both things together.

[greg0ire]

Argh, wrong branch… well, you will have to wait for 2.20.0 to get your bugfix. Thanks for working on that anyway, and congrats on your first contribution.

[timum-viw]

Yeah, noticed that too when I read the part in the docs about picking the right branch 😆 thanks for your fast replies and your general work on doctrine!