feat!: removing handler_processing debugger in favour of status

[nicholasgriffintn]

Resolves #469

Description:

The PR removes the debugger that was previously added that would send a handler_processing debug log every second while polling was ongoing.

This is no longer required as the new status method returns this information.

Type of change:

• 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)

Why is this change required?:

This simplifies the codebase and makes it easier for us to maintain, and to understand.

Code changes:

• Removes the handler_processing debugger
• Changes waiting_for_polling_to_complete and waiting_for_polling_to_complete_timeout_exceeded to emit so users can react to them easier
• Fixes some flaky test issues

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[codeclimate]

Code Climate has analyzed commit 16a08db and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 98.3% (0.0% change).

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