`init` CLI Command

[mFragaBA]

What should be done?

Add an init command to the cli that creates the necessary files to run the client (currently the miden-client.toml configuration file).

How should it be done?

• It should be added as another clap subcommand
• Make sure that whenever we run a CLI command we use either the config file from the current dir, or check parent directories similar to what git does
• Check if it's possible to add a message that is displayed after cargo install. If so, add a message suggesting the usage of miden-client init
• Decide whether it should be possible to use if there is an existing config file already

When is this task done?

The task is done when you can run miden-client init and run commands on those particular client settings (test it from outside of the miden-client repo)

Additional context

No response

[igamigo]

Reference: https://github.com/0xPolygonMiden/miden-base/pull/531#discussion_r1538038839 Main motivation is to keep the client more self-contained and easier to start in terms of config when installing from crates.io.

[mFragaBA]

closing as #242 got merged, idk why this didn't close automatically