Staff Email Handling

[ejoranlienea]

Description & motivation

This adds two primary features:

First, Ed-Fi introduced StaffEducationOrganizationContactAssociation, which provides a second possible place to put email addresses (in addition to staffs itself). This PR adds a build model that combines emails from the two sources into one unified list
.
Second, it also adds a second build model on top of this that attempts to filter this down to only official/work emails, which can be useful for syncing to authentication/authorization systems, or other use-cases that require only valid, official email addresses. It does this by applying 3 filters:

1. Check whether the email address is structurally valid
2. Filter to email addresses tagged with a descriptor that indicates official/work email (configurable)
3. In case of data entry errors, also attempt to remove emails from personal-looking domains (also configurable).

Breaking changes introduced by this PR:

PR Merge Priority:

• Low
• Medium
• High

Changes to existing files:

New files created:

Tests and QC done:

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.
• 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
• 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)

[rlittle08]

one comment on regex^ otherwise ready to merge & release