parametric: adds dd_ prefix to APMLibrary methods that interact with the Datadog API

[mabdinur]

Motivation

• OpenTelemetry parametric library interfaces are prefixed with otel_ but Datadog interfaces do not have a prefix. This PR adds a dd_ prefix to APMLibrary operation that interact with Datadog APIs.

Changes

• Renames:

  • APMLibrary.start_span to APMLibrary.dd_start_span
  • APMLibrary.flush to APMLibrary.dd_flush
  • APMLibrary.inject_headers to APMLibrary.dd_inject_headers
  • APMLibrary.extract_headers to APMLibrary.dd_extract_headers
  • APMLibrary.current_span to APMLibrary.dd_current_span
  • APMLibrary.get_tracer_config to APMLibrary.config, this interface can retrieve configurations that are not unique to tracing.

• Removes:

  • APMLibrary.finish_span this method is not used

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner. We're working on refining the codeowners file quickly.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team