feat(internal): cogs

[GAlexIHU]

Overview

Rudimentary cost-of-goods-sold estimates based on round-trip times...

TODO

• [ ] Make RouteHandler and other attributes/labels available inside handlers (currently only otelhttp accesses them)
• [ ] Implement for Postgres
• [ ] Implement for ClickHouse
• [ ] Implement for Redis
• [ ] Implement for Compute

Notes

On a more general note, using OTEL metrics for this is far from ideal... once the actual measurements are figured out / implemented, it would be a fairly small lift to send this data to OpenMeter instead of the OTEL target...