Ensure that the Service proxy has loaded all the collections present in the Secret Service.
This affects the result of [methodService.get_collections].
You can also pass the LOAD_COLLECTIONS to [func
Service.get_sync] in order to ensure that the collections have been loaded by the time you get the
Service proxy.
This method will return immediately and complete asynchronously.
| this |
the secret service |
| cancellable |
optional cancellation object |
| callback |
called when the operation completes |
| user_data |
data to be passed to the callback |