Write deployment script

[QGarchery]

There should be some non trivial code in it, notably the code of the proxy itself.
This would make it possible to check things that need to be done right at deployment, such as using the correct ERC1967Proxy contract, passing the right dao argument to the Morpho initializer, doing the deployment in the right order, etc

@MerlinEgalite noted that it's already done in the migration tests, but would it be better if there was a script as well, to ensure that this is what will be used for deployment ?