Add code and data to query multiple nodes and convert the resulting data into the CRDCH model

[gaurav]

This will likely be a Python program using the CRDCH Python data classes to query and convert node data into CRDCH instance data.

If there are automated steps here, there should be a manual review process in case the matching was incorrect.

This is part of https://github.com/orgs/cancerDHC/projects/6
Depends upon:

• Agree on data sources data-model-harmonization#22
• Agree on queries data-model-harmonization#21