Support for renamable datasets

[normanrz]

Detailed Description

Webknossos is about to support renamable datasets, which will enable to have multiple datasets with the same name in an organization.

I think the libs need the following features:

• Dataset.open_remote should still work as expected
• An API to get Datasets by name, which returns a list of datasets (similar to RemoteDataset.get_remote_datasets)
• The RemoteDataset should have an id and an createdAt (or uploadedAt) property
• The name property of a RemoteDataset should become mutable

[normanrz]

An API to get Datasets by name, which returns a list of datasets (similar to RemoteDataset.get_remote_datasets)

We should probably have a filter to select by folder.