Add support for reducible java.jdbc calls

[senior]

Opening this PR as what I think is probably the most straightforward way to incorporate the reducible support that java.jdbc has added. Not sure if this is the best way, but it seemed like the easiest. Submitting this as an RFC of sorts. If this approach seems like the right way to go about it, I'll get the tests and docs written up to accompany it.

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[camsaul]

In principle this looks good but we should add some tests & dox. Then we can merge

[senior]

@camsaul done