feat: add fact_current_enrollments model

[Ian2012]

Description

This PR adds a model to get the latest enrollment status of a learner but with extra course and learner information.

partially fixes: openedx/wg-build-test-release#368

Changes need to be applied to Superset.

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[bmtcril]

This seems to overlap a lot with fact_enrollment_status, but doesn't seem to actually limit to the most recent row? I think you should probably just make this join the user data onto that?

[Ian2012]

It's the same data but with the joined course and user data, however, the MV will only be updated on changes to the enrollments, so if I join user pii with fact_enrollment_status the data will be outdated. fact_enrollment_status stored the latest enrollment status however the data is eventually consistent so I will add a group by clause

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