Copy `sentry_tags`, `tags`, `measurements` into `data` when producing to Kafka

[Dav1dde]

In Relay's Kafka producer (StoreService) we have to copy (not move) all values from sentry_tags to data and prefix them with sentry., only the description is slighlty special cased. The same is true for tags and measurements.

Snuba already does this logic, we just need to port this to Relay: https://github.com/getsentry/snuba/blob/4cf53a83cc5051551612b3ae8a5556228588f731/rust_snuba/src/processors/eap_items_span.rs#L153-L162