fix(consumer): Immediatly stop polling, abort current request

[yehor-manzhula]

Description

Stopping polling timeout and current polling request.

Motivation and Context

Stop method doesn't gracefully terminate polling:

1. Stop method doesn't abort current polling request
2. "Stopped" event emitted after polling timeout execution, that doesn't make any sense.

Actuall polling stop depends on: waitTimeSeconds + Messages processing time + pollingWaitTimeMs Multiple polls invoked

Types of changes

• [ ] 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 change)

  Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[nicholasgriffintn]

Closing this PR given the age and changes requested above, if you would still like to contribute please open a new PR, we may look into this separately as well.

[github-actions[bot]]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.