WIP: ENT-2664 added task for inserting course_structure to mysql

[irfanuddinahmad]

Description: This PR creates tasks for a report of enterprise learner engagement in insights. Also creates a task for pushing course_block_records as insights.course_structure.

JIRA: ENT-2664, ENT-2548

Status: A work in progress PR for initial feedback.

Analytics Pipeline Pull Request

Make sure that the following steps are done before merging:

• [ ] If you have a migration please contact data engineering team before merging.
• [ ] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [ ] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #807 into master will decrease coverage by 0.02%. The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #807      +/-   ##
==========================================
- Coverage   74.37%   74.34%   -0.03%     
==========================================
  Files         211      211              
  Lines       24399    24420      +21     
==========================================
+ Hits        18146    18155       +9     
- Misses       6253     6265      +12

Impacted Files	Coverage Δ
...ehouse/load_internal_reporting_course_structure.py	34.88% <42.85%> (+0.45%)	:arrow_up:

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