aws_securityhub_finding - Add key column on created_at and updated_at

[michalz-rely]

Is your feature request related to a problem? Please describe.
When querying aggregator account and region there are situations where the amount of findings leads to many minutes/hours of data fetching. In order to see the findings generated in past 24h, plugin needs to first dump all the findings (90 days).

Describe the solution you'd like
New key columns created_at and updated_at, so the filtering would be done on the API level instead on SQL level

Describe alternatives you've considered

Additional context

[github-actions]

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