feat(console-wallet): add contract-definition init command

[sdbondi]

Description

• Adds tari_console_wallet contract-definition init command
• Moves publish-contract-definition command to subcommand of contract-definition i.e. contract-definition publish

Motivation and Context

Generates an initial contract definition spec file for the user to edit. All contract definition related commands are under the contract-definition subcommand.

USAGE:
    tari_console_wallet contract-definition <SUBCOMMAND>

OPTIONS:
    -h, --help       Print help information
    -V, --version    Print version information

SUBCOMMANDS:
    help       Print this message or the help of the given subcommand(s)
    init       Generates a new contract definition JSON spec file that can be edited and passed
                   to other contract definition commands
    publish    Creates and publishes a contract definition UTXO from the JSON spec file

How Has This Been Tested?

Manually