[Proposal] Deploy command refactor

[jrchatruc]

💥 Proposal

The aleo deploy command currently delegates most of its behaviour to snarkVM, including broadcasting the transaction to the blockchain. This is not ideal, as the VM should only be concerned with the crafting of the transaction (i.e. the execution/proof generation), but not the broadcasting aspect; instead, it should return the Deployment, which the CLI then converts into a transaction and broadcasts.

This also allow us to remove the custom deploy node endpoint, which currently just (almost) duplicates the broadcast logic.