Consider returning the final Upgrade transaction signature on `solana program deploy`

[ellttBen]

Problem

Currently, the solana program deploy command only returns the deployed program's programId. In the context of program upgrades it would be very useful to get the transaction signature for the final Upgrade transaction. Having a precise history of deployments is very useful for dealing with potential issues and dealing with several versions of the same program when parsing its transaction history.

Proposed Solution

A transaction_signature field should be added to the solana program deploy output. I am willing to make a quick PR for this if there is any interest.

[buffalojoec]

I am willing to make a quick PR for this if there is any interest.

Sure!