refactor: Service layer for analytics events/enrol. [DHIS2-18005] #18596
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This PR focuses on the analytics events/enrollments APIs.
It splits the responsibilities related to query and aggregation at the service layer.
Now, each flow is more isolated, and there is less confusion about which part of the code belongs to what.
Also, non-necessary one-to-one interfaces and abstract classes were removed, making things simpler and easier to read/maintain.