[Feature Request] Make VM parametric in serialization format

[sblackshear]

The VM uses BCS for serialization, but there's nothing fundamental preventing Move from supporting multiple serialization formats. Allowing the adapter to choose a serialization format for the VM would enable more efficient usage of Move in settings where the host system's data is not BCS-encoded.

[tnowacki]

This will be rather tricky, but not impossible, since there are BCS-encoded values inside of compiled module+script bytes, in the form of constants

[sblackshear]

Ah, interesting point... I think that is ok, though. It means the VM will always have to understand how to deserialize BCS bytes into a MoveValue to execute code, but at least we can free clients from needing to pass BCS into the VM and reading BCS output if they would prefer to use a different format.