[OTel] Improve Span attributes for Messaging events

[tonyo]

Extracted from https://github.com/getsentry/sentry-go/issues/557 and https://github.com/getsentry/team-webplatform-meta/issues/32.

Re-evaluate how we set operation/description for messaging spans: https://sentry-sdks.sentry.io/performance/otel-demo-checkoutservice:3a93068eca0d4acb9c7865f68ba5183f

According to https://develop.sentry.dev/sdk/performance/span-operations/#messagesqueues, we should set topic.* attributes.

[yolkhovyy]

Related discussion here https://github.com/getsentry/sentry-go/discussions/639