added agent topic scanner

[ChaseMillers]

PR Description:

Added a background script that analyzes Virtual Agent conversation logs to identify the most common topics over a configurable time period.
Test:

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[snamjosh]

Thanks for your contribution.
Looks good to me.

Also, please note that this is available OOB with conversational analytics dashboard to find out about most used topics.

https://www.servicenow.com/docs/bundle/yokohama-conversational-interfaces/page/administer/virtual-agent/concept/dashboard-explore-dashboard-pae.html