Figures pipeline performance improvement

[johnbaldwin]

This PR contains code to improve Figures pipeline performance for collecting daily metrics

This PR follows on https://github.com/appsembler/figures/pull/427

What is in this PR?

• figures.course - A new module to simplify retrieving data about a specific course. See commit, https://github.com/appsembler/figures/pull/429/commits/839b3226933215c9e4b4e6233ab941707498bc00
• figures.pipeline.enrollment_metrics_next - A new module to support an alternate workflow to collect per-enrollment metrics and provide aggregate progress metrics. See commit, https://github.com/appsembler/figures/pull/429/commits/4dcbd75301545b2689f9079e5f6f8a30accfad31
• Update to figures.pipeline.course_daily_metrics to allow the deployment to chose which enrollment data collection and reporting to use. See commit, https://github.com/appsembler/figures/pull/429/commits/76aea1280500fd2da68dc4ba1a578b4b89611c2c
• Update to figures.tasks to provide new tasks to run this alternate workflow. See commit, https://github.com/appsembler/figures/pull/429/commits/2f087967d5cb5d2246a8bcd6637a1614d8e1aebf

See also https://github.com/appsembler/figures/issues/428

What needs to follow on as a new PR

• Update the Django management commands to backfill data