[Epic] Implement catalogd content storage+serving

[joelanford]

Design Docs

• Brief: Catalogd Content Storage+Serving
• RFC: Catalogd Content Storage+Serving

Task List

• Deprecate the feature gates associated with catalog content CRs #115
• Serve locally stored fbc content via a server #113
• Update the Catalog controller to use a Storage interface #114
• Add ETag support to the Storage implementation #128
• Update Catalog.Status to include the URL to fetch catalog content from #119
• Remove deprecated feature gates and associated functionality/code #116
• Create a minimal client library #117
• Ensure HTTP endpoints are accessible outside the cluster #118
• Write documentation on getting catalog contents #120
• Add metrics to the Storage implementation #127
• Update catalog content retrieval method operator-controller#293

[everettraven]

All linked issues have been completed. Closing this issue