chore: uploads command

[notnmeyer]

➜ loops uploads create -h

  Upload a file as an email asset

  USAGE


    loops uploads create <path> [--flags]


  FLAGS

    --content-type         Mime type to use for the upload (default: sniffed from file contents)
    --debug                Print API request details before sending
    -m --email-message-id  Email message this asset belongs to (required)
    -h --help              Help for create
    -o --output            Output format (text, json) (text)
    -t --team              Team key name to use

depends on loops-so/loops-go#5

[notnmeyer]

TODO: update this with the final release