574400 - Clickhouse QueryBuilder for NewAiUserMetricsService

What does this MR do and why?

This MR is part for breaking !210409 down.

Here we are adding a new service that's more extendable from the original AiUserMetricsService. What has changed is:

• Accepting specific event names as a filter
• Consolidating multiple separate database queries into a single query

The next MR will update graphql endpoint to use this new service and add new fields

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Run the spec file

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Related to #574400