Fix/add exemplars

[Chromatius]

Description

Make exemplars work for the ASGI and WSGI instrumentations.

This should be an isolated change that does not impact anything else.

Fixes open-telemetry#3031

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

New unit tests were added to confirm that exemplars were not added in the original versions. These tests are passing after the fix.

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

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

[felix-hilden]

Many thanks! All looks good at least for us to present it to the OTEL repo. I rebased on the most recent main too so the changes are clean now. But why the uv.lock change?

[Chromatius]

The uv.lock changes came from just installing the repo and were not needed for the PR. I have reverted those changes now.