Query's errors not handled #1264
Description
When a query is a success from the HTTP's point of view (code 200), but a failure regarding the smart contract (code != 0), the sdk panics. This is not a wanted behavior since we cannot handle the errors easily, the only way to do so is by unwinding the stack which is a bad practice.
This error happens because the CommunicationProxy's execute_vmquery method try to parse the result to a ResponseVmValue, regardless if the query is a success or not.
To reproduce:
Query any smart contract with a random function to have the "invalid function" error
(I will likely do a PR soon to fix this)