[mlir][emitc] Apply type converter to memref element types in -convert-memref-to-emitc (#203742) This change fixes a few places where the memref-to-emitc conversion didn't properly convert memref element types. This PR updates both memref.alloc and memref.copy to convert the memref element type when using the element type for `sizeof` calls, as well as generating the output pointer type (just for `alloc`). This was missed because there are no `convert-to-emitc` tests that use a type converter with custom types, so I added such a registration to the test dialect. It is worth noting that, while this patch only affects `-convert-memref-to-emitc`, the change has no impact without the additional type converter registrations in `-convert-to-emitc` because there are no builtin types that have nontrivial emit conversions today. As a drive-by improvement, I deduped a "total size in bytes" calculation that was happening in the lowerings for both `memref.alloc` and `memref.copy`.
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