Aggregation option in Kinesis Writer Python sdk

[Nakachi-S]

addresses #34319

I have added an option to do aggregation in the apache_beam.io.kinesis module.

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[Nakachi-S]

@damccorm
Hi!
I opened the issue in the comments and created this PR.
Could you please review it?

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[damccorm]

Thanks - this generally looks like a good change to me, just had one comment

[damccorm]

Thanks - this mostly LGTM, would you mind fixing the failing lint/format checks though? You can see how to do this here - https://cwiki.apache.org/confluence/display/BEAM/Python+Tips#PythonTips-LintandFormattingChecks

[Nakachi-S]

@damccorm
Thanks for checking.
Some CI checks are failing.
I checked and I don't think those failures are related to my changes, how can I help?

[damccorm]

@damccorm Thanks for checking. Some CI checks are failing. I checked and I don't think those failures are related to my changes, how can I help?

I agree, these looked like transient flakes - I reran the checks and they passed

[damccorm]

Thanks!