Load loads a sheet from uri. The way how the sheet is loaded is determined by
the file extension. If uri should have a http(s) scheme, the sheet is fetched
from the remote location via a GET request. Otherwise, the file is loaded
from the local file system.
type Options struct {
// Format is the file format to use. If it is set, the given Format will be// used instead of the format specified by the file's extension.
Format string `json:"format,omitempty"`
}