feature: add ability to modify a deploy alias

[barriebyron]

Right now, the zkApp CLI creates a deploy alias with zk config https://docs.minaprotocol.com/zkapps/tutorials/deploying-to-a-network#deploy-alias

However, we are unable to modify an existing deploy alias

It's likely that developers will want to modify existing deploy aliases as they iterate on their development

Enhancement suggestion: add the ability to modify an existing deploy alias (present the current values and change only the ones you want to change)