[3.x] feat: add support for DNF types

[nhedger]

This PR adds support for Disjunctive Normal Form Types (DNF types) when using PHP 8.2.

Overview of the changes

• Removes the previous guard that would only allow ReflectionNamedType to be analyzed.
• Adds two new internal functions matchesType and matchesAllTypes to extract common functionality.
• Adds tests + supporting fixtures

Please let me know if you think that I missed something.

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Closes #235

[SimonFrings]

@nhedger Looks good to me 👍

[clue]

@nhedger Thank you very much for these high quality changes! Functionally, this LGTM and very much appreciate the added tests.

I've added some minor remarks regarding internal functions only, WDYT?

[clue]

@nhedger Thanks for the quick update, changes LGTM! Keep it up! 👍

[WyriHaximus]

Awesome, thank you for putting this together 👍

[clue]

@nhedger Excellent work! Ticket #235 suggests applying the same changes also for 2.x, do you plan to backport this to the other branch or should anybody else take a look at this? 👍

[nhedger]

I'll do it, probably before the end of the week.