Add mem_uninitialized lint to FCW lint on uses#100342
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This PR adds a lint that will detect uses of
std::mem::uninitialized(using themem_uninitializeddiagnostic item) that are not definitely of "basic" types like int/float/raw pointer, and emit a FCW lint for it.For generic cases, we can't say it's definitely UB, just that it might be.
Background: #98862 (comment)