Install rector, add rector config, add rector changes, add rector for CI

[Harfusha]

[Harfusha]

https://github.com/cakephp/cakephp/issues/17865

[ADmad]

I am not in favor of adding rector as a dev dependency, nor running rector as a part of CI, that's wasteful.

These pedantic opioniated changes don't fix any actual problem nor bring any significant performance gains.

We can instead have a separate workflow which runs on a weekly basis and reports the diff or auto create a PR which we can review.

[dereuromark]

We can also just composer require it at runtime directly inside the job. Thats probably best.

[othercorey]

I would agree that rector is not our coding standard. We don't need another large static analyzer running on each commit.

[dereuromark]

Do you want to refactor similar to other analyzer tasks to run only in ci? Without modifications to Code base?

[dereuromark]

ping @Harfusha

[Harfusha]

Sorry i dont have any time right now. I will look into this issue when i find some free time

[dereuromark]

https://github.com/cakephp/cakephp/pull/18625