Add extra metrics

[brucetony]

• Data transfer volume per analysis (e.g., “data transfer to external systems (hub/aggregator/possibly other nodes) within an analysis > X MB”)
• Number of API calls (total and optionally per endpoint)

[brucetony]

• Also make events filterable by analysis_id and project_id

[brucetony]

The analysis and project filtering will be address in #174