Add deploy command

[jasongitmail]

1. Add command snapp deploy <network>
2. Exclude config file from git
3. If config file does not exist yet, create it and create an address & private keypair and say: "Testnet address & private key created & added to config.js". (User can overwrite this with their own address & private key, if updating an existing Snapp.)
4. If config exists, check if network name exists. If not, create address & private key as above. If yes, we'll use it.
5. "Continue with deploy to y/n?"
6. Create TX from proof.
7. Send to proper network.

• Alternatively, make it interactive and allow user to select tesnet or devnet
• Add step to run tests first?

[jasongitmail]

The UX for this is done, implemented, reviewed & merged. But we are waiting for tx construction and signing to be finished so we can plug in the pieces to make it work.

[jasongitmail]

@MartinMinkov is going to finish integrating Mina Signer & the tx construction result: https://github.com/o1-labs/zkapp-cli/blob/main/src/lib/deploy.js#L126

[jasongitmail]

Finished! We also added the support for zk deploy when no network alias is provided, a dropdown list of available options is shown.