Explore Additional Ways to Expose Capabilities via the ExtendedPlayerPlugin

[KetanReddy]

Right now the ExtendedPlayerPlugin uses generic arguments to hold the interfaces for each Capability which is then parsed by the CLI to convert the interfaces to XLR. While it works, there might be a cleaner way to do this. The keys to a good design here are:

1. It should be easy for capability authors to write/maintain
2. It should be explicit
3. It should be verifiable
4. It should be easy to parse