Retrieves a list of all statements from a given source that match the specified target and
statement string. The API guarantees that all statements with secure source assets, such as HTTPS
websites or Android apps, have been made in a secure way by the owner of those assets, as
described in the [Digital Asset Links technical design
specification](https://github.com/google/digitalassetlinks/blob/master/well-known/details.md).
Specifically, you should consider that for insecure websites (that is, where the URL starts with
`http://` instead of `https://`), this guarantee cannot be made. The `List` command is most
useful in cases where the API client wants to know all the ways in which two assets are related,
or enumerate all the relationships from a particular source asset. Example: a feature that helps
users navigate to related items. When a mobile app is running on a device, the feature would make
it easy to navigate to the corresponding web site or Google+ profile.
Create a request for the method "statements.list".
This request holds the parameters needed by the digitalassetlinks server. After setting any
optional parameters, call the
AbstractGoogleClientRequest.execute() method to invoke the remote operation.