Adds recursive inheritance awareness to ClassNode so rules can detect interface implemented through scanned parent chains.

For example, this now resolves correctly:

class A extends B {}
class B extends C {}
class C implements \Psr\Http\Server\MiddlewareInterface {}

A is now treated as implementing \Psr\Http\Server\MiddlewareInterface.

The example usage is in ClassImplementingInterfaceMustHaveSuffixRule, which now applies to class extends another class extends another class that implements \Psr\Http\Server\MiddlewareInterface.

This keeps PSR-15 suffix checks compatible with custom middleware/request-handler before reach root \Psr\Http\Server\MiddlewareInterface.