feat(opentelemetry-instrumentation-aiokafka): wrap getone instead of anext, add tests

[dimastbk]

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Description

Wrap getone instead of anext Add tests for opentelemetry-instrumentation-aiokafka (#2082)

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?

Does This PR Require a Core Repo Change?

• [ ] Yes.
• [x] No.

Checklist:

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

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