OPIK-58 Add trace usage

[andrescrz]

Details

Added new usage field on Trace, which is calculated by summing the values of all the spans under the particular trace, per each usage key.

Due to summing, using Long type and summap function in ClickHouse instead of Integer and summapwithoverflow.

Some minor fixes in a few queries and also improved many Trace tests along the way.

Issues

OPIK-58

Testing

• Added and updated integration tests:
  • Summing usual token values.
  • Mixed with other random keys.
  • Mixed with missing keys.
  • Mixed with null keys.
  • Spans with null values case.
• Tests for all Trace retrieval endpoints: get by ID and find endpoints.
• Existing tests already check the case of no spans under the trace, resulting in a null trace usage.

Documentation

• https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/summap
• https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/summapwithoverflow
• https://clickhouse.com/blog/aggregate-functions-combinators-in-clickhouse-for-arrays-maps-and-states