Add `cb config-param` support.

[abrightwell]

Add basic support for managing supported cluster configuration parameters.

This command provides the following sub-commands:

❯ cb config-param --help
Usage:
    cb config-param <command>

Commands:
    get                              display one or all configuration parameters for a cluster
    list-supported                   display supported configuration parameters
    reset                            reset one or more configuration parameter values to default
    set                              set one or more configuration parameter values

Options:
    -h, --help                       Show this help

[abrightwell]

There are still some pending API updates that will be required for this one to be complete. However, those are minimal and will be addressed very soon.

[abrightwell]

@ngaumont mind taking another look at this one? 🙂

[abrightwell]

Thanks @ngaumont!