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inference: add reflection utility for exception type analysis
This commit defines functions that mirror our tools for analyzing return types and computational effects. The key point to discuss is that this commit introduces two functions: `Base.exception_types` and `Base.exception_type`. `Base.exception_types` acts like `Base.return_types`, giving a list of exception types for each method that matches with the given call signature. On the other hand, `Base.exception_type` is akin to `Base.infer_effects`, returning a single exception type that covers all potential outcomes entailed by the given call signature. I personally lean towards the latter for its utility, particularly in testing scenarios, but I included `exception_types` too for consistency with `return_types`. I'd welcome any feedback on this approach.
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