Opentelemetry: tapir integration

[grouzen]

During the investigation of #975 it became clear that tapir requires a special integration similar to the already existing integration for otel4s https://github.com/softwaremill/tapir/blob/master/tracing/otel4s-tracing/src/main/scala/sttp/tapir/server/tracing/otel4s/Otel4sTracing.scala

think a module similar to Otel4sTracing should solve this problem (aka RequestInterceptor). The tracing tapir module for zio-opentelemetry can support both autoinstrumented and manual modes. The former will use OpenTelemetry.autoinstrumented + OpenTelemetry.global, while for the latter we need to use OpenTelemetry.continue + OpenTelemetry.custom + an ability to set a desired span name, instrumentation scope and so on.

It can be done in Tapir's repo.

[grouzen]

Probably the same must be done for the ZIO HTTP Endpoints API, as shown in https://github.com/maxstreese/zio-otel-playground, where the spans do not get connected in autoinstrumented mode.

[grouzen]

I think this issue may finally be closed thanks to @cheleb's excellent work done in the Tapir repo: softwaremill/tapir#5256