[OTEL] Determine span OP from semantic attributes

[lcian]

Problem Statement

Currently we just set span.op to default.
span.op is queryable via EAP, so it's important to set it to a meaningful value to have a good UX.

Solution Brainstorm

Implement logic similar to this one https://github.com/getsentry/sentry-javascript/blob/master/packages/opentelemetry/src/utils/parseSpanDescription.ts