Use Interpreter parsing to check the prior code

[samuelmanzanera]

Currently, we are doing a strict comparison between the smart contract to ensure integrity.
However, if the formatting change for example due to white spaces, backspaces.... so the transaction is invalid.
To improve this, we can parse both the contract and check the AST are the same, hence the contract's code will be validated.

[tenmoves]

we can look at how recompile works under the hood to get inspiration.