Describe the bug

I've run into the fact that Decimal32 doesn't support sum. Looking around I've noticed that multiple aggregations don't support decimals (as noted by by this old issue).

The new decimal types also lack a matching ScalarValue variant, and I've seen a couple of other places where they will just error.

If there is no explicit reason not to support them, I would love to take this issue forward, I already have some code but figured I should make sure I'm not missing something before I move forward.

To Reproduce

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Expected behavior

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Additional context

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