Remove support for Doctrine Cache

[derrabus]

Q	A
Type	improvement
BC Break	yes
Fixed issues	N/A

Summary

This PR resolves the deprecations introduced by #4620 and #4624.

[morozov]

@derrabus I believe you can proceed here.

[derrabus]

The PR is ready. 🙂

[SenseException]

Please also adapt caching.rst in the docs (https://github.com/doctrine/dbal/blob/4.0.x/docs/en/reference/caching.rst) where $config->setResultCacheImpl($cache); is used in an example.

[derrabus]

@SenseException The documentation will be fixed with #4652. Let's keep it out of this PR.

[morozov]

Let's keep documentation in sync with the code within each commit. Since the PR removes a method, it must remove it from the documentation as well.

[greg0ire]

Since that method is deprecated, the documentation can be removed before the method itself is removed, so if we merge #4652 , there will be nothing to remove (unless there are more occurrences than the one in #4652 ?). Let's avoid the necessary conflicts, and block this PR until #4652 is merged up?

[morozov]

I still see that setResultCacheImpl() is referenced in the documentation although it's being removed in this PR.

[SenseException]

@morozov The changes in caching.rst are already merged and up-merged into 4.0.x. Or do you refer to other occurrences of the method calls?

[morozov]

I was referring to

dbal/docs/en/reference/caching.rst

Lines 11 to 14 in c08fd1e

	<?php
	$cache = new \Doctrine\Common\Cache\ArrayCache();
	$config = $conn->getConfiguration();
	$config->setResultCacheImpl($cache);

If this has been addressed in 4.0.x, please feel free to merge.

[derrabus]

I've rebased my PR onto 4.0.x. The docs should be correct now. 🙂

[morozov]

Thanks, @derrabus!