Add rule to detect implicitly nullable native types

[thg2k]

Feature request

With the very unfortunate acceptance of the implicitly nullable types deprecation RFC the following signature:

function foo(int $a = null): void

Will rise the following deprecation error in PHP 8.4:

Deprecated: foo(): Implicitly marking parameter $a as nullable is deprecated, the explicit nullable type must be used instead

I believe it would be useful to have a bleeding edge feature toggle to prepare for this change.

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No response

[ondrejmirtes]

It doesn't have to be bleedingEdge, but it only will be reported when running on PHP 8.4, or when phpVersion is set to 80400 or higher.

[thg2k]

It would be nice to have it as feature toggle to test it on lower versions as well, but I suppose one can just bump the global phpVersion parameter...

[ondrejmirtes]

Implemented phpstan/phpstan-src@9bd027c

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