Proto based source cache service

Raoul Hidalgo Charmanrequested to merge
raoul/1038-source-cache-proto into master

Description

This moves to using source protocol buffers to store source information rather than the old reference service that just stored hashes.

Changes proposed in this merge request:

  • Add source protocol buffer format
  • Implement this for the CASServer
  • Expand capabilities service to include source capabilities
  • Change client to use this new service

This merge request, when approved, will close: #1038 (closed)

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