Create AiUserMetrics table and model

Pavel Shutsinrequested to merge
512247-add-lastduoactivityon-field-to-usergraphql-type into master

What does this MR do and why?

This table will be used to store various AI related metrics for each eligible user. Expected volume: small. 1 record per each Ultimate user with Duo Pro+ activity. The model will be used in upcoming MRs to store last_duo_activity_on field.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #512247 (closed)

Edited by Pavel Shutsin

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