Lists provider sets in packages given on the command line, including
outputs grouped by what is needed to obtain them.
The goose package now exports the loading phase as an API.
Example output: https://paste.googleplex.com/5509965720584192
Reviewed-by: Tuo Shan <shantuo@google.com>
An interface binding instructs goose that a concrete type should be used
to satisfy a dependency on an interface type. goose could determine this
implicitly, but having an explicit directive makes the provider author's
intent clear and allows different concrete types to satisfy different
smaller interfaces.
Reviewed-by: Tuo Shan <shantuo@google.com>
