Fix multi-memory + C API for MemoryGrow and MemorySize (#4953)

Those instructions need to know if the memory is 64-bit or not. We looked that
up on the module globally, which is convenient, but in the C API this was actually
a breaking change, it turns out. To keep things working, provide that information
when creating a MemoryGrow or MemorySize, as another parameter in the C
API. In the C++ API (wasm-builder), support both modes, and default to the
automatic lookup.

We already require a bunch of other explicit info when creating expressions, like
making a Call requires the return type (we don't look it up globally), and even a
LocalGet requires the local type (we don't look it up on the function), so this is
consistent with those.

Fixes #4946

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