refactor commands for better separation

[conradludgate]

Bit of a random one. I want us to start using tracing on server, but keep log for client for now. This also adds a better separation of concerns to me

[ellie]

Happy to merge once the conflicts are sorted! I agree it makes more sense this way :)

[conradludgate]

For sake of clarity, this is the output of atuin --help before and after

before:

atuin 0.8.1
Ellie Huxtable <e@elm.sh>
Magical shell history

USAGE:
    atuin <SUBCOMMAND>

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

SUBCOMMANDS:
    history            Manipulate shell history
    import             Import shell history from file
    server             Start an atuin server
    stats              Calculate statistics for your history
    init               Output shell setup
    uuid               Generate a UUID
    search             Interactive history search
    sync               Sync with the configured server
    login              Login to the configured server
    logout             Log out
    register           Register with the configured server
    key                Print the encryption key for transfer to another machine
    gen-completions    Generate shell completions
    help               Print this message or the help of the given subcommand(s)

after:

atuin 0.8.1
Ellie Huxtable <e@elm.sh>
Magical shell history

USAGE:
    atuin <SUBCOMMAND>

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

SUBCOMMANDS:
    history            Manipulate shell history
    import             Import shell history from file
    stats              Calculate statistics for your history
    init               Output shell setup
    uuid               Generate a UUID
    search             Interactive history search
    sync               Sync with the configured server
    login              Login to the configured server
    logout             Log out
    register           Register with the configured server
    key                Print the encryption key for transfer to another machine
    gen-completions    Generate shell completions
    server             Start an atuin server
    help               Print this message or the help of the given subcommand(s)

(To save you from spot the difference, all that is changed is the position of the server subcommand)