Check for __name__ before tracing a coro

[fnmut]

Description

Asyncio send function does not have a name. This checks for name before tracing.

Fixes #2340

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?

Used the repro case in issue #2340

I am also running tests locally but they are taking a long time...

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: fnmut / name: Christian Burke (7d693fc, 6dc1ff1)
• ✅ login: ocelotl / name: Diego Hurtado (e8fb8b1)

[xrmx]

It would be great to add a test. BTW to reduce the number of tests to run locally you can run a specific tox environment instead of all, e.g. tox -e py311-test-instrumentation-asyncio if you python 3.11.

Also please add an entry in the CHANGELOG.md under Unreleased > Fixed