ResultCache: allow customization of params not invalidating cache

[janedbal]

• Currently, I'm improving our dead-code-detector with some optional debug output.
• This is configured via parameter that is wired to a Rule hooked to CollectedDataNode.
• As this runs after parallel analysis is done, changing such parameter never affects result cache, but it gets invalidated anyway.
• This PR solves this issue by providing configuration option where even phpstan extensions can mark their parameters as not affecting result cache.

[ondrejmirtes]

Thank you!

[janedbal]

Thank you!