feature/:Enhanced dim_course_section to expose section_characteristics descriptors

[smckee-tnedu]

Description & motivation

After the fix for course_level_characteristics, the visibility of section characteristics was gone. This set of changes brings that visibility back.

Breaking changes introduced by this PR:

This change requires a new xwalk: xwalk_section_characteristics.csv. An example looks like this:

section_characteristic_descriptor,indicator_name
Fall Block,is_fall_block
Spring Block,is_spring_block
Year-long,is_year_long

PR Merge Priority:

• Low
• Medium
• High

Changes to existing files:

• models/core_warehouse/dim_course_section.sql : Uses a new build model to expose the descriptors that come in on the sections_characteristics field.

New files created:

• models/build/edfi_3/courses/bld_ef3__section__wide_section_characteristics.sql : Builds a set of wide columns that can be accordioned in dim_course_section.

Tests and QC done:

This has been tested within stadium_tennessee.

edu_wh PR Review Checklist:

Make sure the following have been completed before approving this PR:

• Description of changes has been added to Unreleased section of CHANGELOG.md. Add under ## New Features for features, etc.
• Code has been tested/checked for Databricks and Snowflake compatibility - EA engineers see Databricks checklist here
• Reviewer confirms the grain of all tables are unchanged, OR any changes are expected, communicated, and this PR is flagged as a breaking change (not for patch release)
• If a new configuration xwalk was added:
  • The code is written such that the xwalk is optional (preferred), and this behavior was tested, OR
  • The code is written such that the xwalk is required, and the required xwalk is added to edu_project_template, and this PR is flagged as breaking change (not for patch release)
  • A description for the new xwalk has been added to EDU documentation site here
• If a new configuration variable was added:
  • The code is written such that the variable is optional (preferred), and this behavior was tested, OR
  • The code is written such that the variable is required, and a default value was added to edu_project_template, and this PR is flagged as breaking change (not for patch release)
  • A description for the new variable has been added to EDU documentation site here