Add a command to the CLI to call a contract's public function

Require: https://github.com/archethic-foundation/libgo/issues/24

3 parameters:
- contract_address: string,
- function_name: string,
- args: any[]

I think the behaviour for args should be similar to recipients.

Start by reviewing the existing CLI command structure and the recipients argument handling, then check the required libgo issue for contract-call support. The work is done when a command accepts a contract address, function name, and argument array and invokes the public function consistently with the stated argument behavior.

Written by the indexing model from the issue text.