Test out unpacking of DRS Bundles, including objects of different types

[ianfore]

Current examples would be those from the NCBI DRS implementation. SDL is also model for the use case. See examples in #105 which could come from sequence data or imaging.

The hackathon exercise would be to write client code to unpack bundled objects as needed for the client's purposes. This would help validate a) the practicality of the DRS specs for bundling b) approaches for bundling data of different types within the framework provided by those specs.

Also a place to discuss pagination within a bundle.