feat: implement fact_student_status model

[Ian2012]

Description

This PR creates an MV for the latest course enrollment status for a learner and renames the fact_grade_status to fact_learner_status with information of the current grade, current approving status and current enrollment status.

It also updates the fact_video_plays model to include video duration and visualization progress.

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[Ian2012]

@daniriosp Does this model update make sense to you?

[SoryRawyer]

@Ian2012 I think my first question above isn't relevant anymore, but I'm still interesting in the answer to my second question. Are there specific charts or dashboards that this dataset is meant to support?

[daniriosp]

@SoryRawyer There are 2 charts using this report. They are in the course dashborad V1 and are called Learners with passing grade and Distribution of Current Course Grade, both in the performance tab.

[Ian2012]

@SoryRawyer I'm still missing the course_run field on all those models. I will let you know when it's done

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