_instrumentation in package.py for instrumentations

[42Questions]

Description

Refs #4173
Move _instrumentation_name to package.py and pass this to trace.get_tracer and metrics.get_meter during instrumentation. This ensures that instruments are created with the expected instrumentation scope name (e.g. opentelemetry.instrumentation.aio_pika).
Add new tests that show output uses new _instrumentation_name.
Do this for opentelemetry-instrumentation-aio-pika to establish pattern and then to roll out subsequently to other instrumentations.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Run tox tests for affected instrumentation pacakgestox -e py3-test-instrumentation-aio-pika-0 -- -k test_aio_pika_instrumentation -v — both existing and new test pass

Does This PR Require a Core Repo Change?

• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[emdneto]

@42Questions can you fix changelog pls

[xrmx]

Aaron did some work around instrumentation metadata as well #4328

[emdneto]

Thanks for the PR!

Just a heads-up: we no longer update CHANGELOG.md directly. The changelog is now generated from changelog fragments using Towncrier.

Please add the appropriate changelog fragment for this change instead of editing CHANGELOG.md manually. You can find the instructions and expected format in CONTRIBUTING.md.