feat(ant-cli): show usage without arguments

[b-zee]

When no subcommand is passed, show the usage and error the CLI.

zamaan@demo:~$ ant
Logging to directory: "$HOME/.local/share/autonomi/client/logs/log_2025-01-06_16-53-20"
error: Please provide a subcommand

Usage: ant-cli [OPTIONS] [COMMAND]

For more information, try '--help'.

zamaan@demo:~$ echo $?
2

zamaan@demo:~$ ant --version
Autonomi Client v0.3.1
Network version: ant/0.3/1
Package version: 2024.12.1.6
Git info: feat-show-usage-on-no-arguments-cli / 463b7068d / 1980-01-01

zamaan@demo:~$ echo $?
0

[grumbach]

LGTM