feat: add workflow write commands

[notnmeyer]

add create, update, and change-mailing-list for workflows, plus node create, update, add-branch, and delete (with --recursive). there's a lot to this one.

➜ task -- workflows -h

  Manage workflows

  USAGE


    loops workflows [command] [--flags]


  COMMANDS

    change-mailing-list <id> [--flags]  Change a workflow's mailing list
    create [--flags]                    Create a workflow
    get <id>                            Get a workflow
    list [--flags]                      List workflows
    nodes [command]                     Manage workflow nodes
    update <id> [--flags]               Update a workflow's name and/or description

  FLAGS

    --debug                             Print API request details before sending
    -h --help                           Help for workflows
    -o --output                         Output format (text, json) (text)
    -t --team                           Team key name to use