Moved async into experimental package for regular release

[MSeal]

Moves the async classes into an experimental module to avoid accidental use. We can revert this PR once we're moving to mainstream support.

Checklist

• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

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JIRA:

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[confluent-cla-assistant]

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[Copilot]

Pull Request Overview

This PR moves the async (AIOProducer/AIOConsumer) classes from the main confluent_kafka.aio package into the experimental module at confluent_kafka.experimental.aio to avoid accidental use in production environments. This change allows for a regular release while marking the async functionality as experimental until it reaches mainstream support.

Key changes:

• Relocated all async classes from confluent_kafka.aio to confluent_kafka.experimental.aio
• Updated all import statements across tests, examples, and documentation
• Created new experimental module structure with proper __init__.py files

Reviewed Changes

Copilot reviewed 22 out of 25 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/confluent_kafka/experimental/	New experimental module structure with async classes
tests/	Updated import paths to use experimental namespace
examples/	Updated import paths and documentation to reflect experimental status
README.md	Updated documentation to mark AsyncIO as experimental
DEVELOPER.md	Updated project layout documentation

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[Copilot]

[nitpick] Unnecessary trailing blank lines at the end of the file. Consider removing the extra blank line.

Suggested change

[Copilot]

[nitpick] Unnecessary trailing blank lines at the end of the file. Consider removing the extra blank line.

Suggested change

[Copilot]

[nitpick] Unnecessary trailing blank lines at the end of the file. Consider removing the extra blank line.

Suggested change

[Copilot]

[nitpick] Unnecessary trailing blank line at the end of the file. Consider removing it.

Suggested change

[k-raina]

Thanks for PR! LGTM
One of semaphore block is failing in pipeline, can we fix that?

[pranavrth]

@k-raina - I am fixing the style issues.

[sonarqube-confluent]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• 100.00% Coverage (66.90% Estimated after merge)
• No duplication information (4.90% Estimated after merge)

Project ID: confluent-kafka-python

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