MIGRATION: Create email preference model #22142
Merged
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A/B Test Functional Specification - https://docs.google.com/document/d/1ZuXD60m5pt1fBfGWDWDRangKIl-5XQGlgramUNDKm1k/edit
Technical Design - https://docs.google.com/document/d/1Q20s8Yv-0FP0yOGb4I9g5ccMP7pqsBcXB6WCytyVi4w/edit
This is a migration to create the table, only. I will open a separate Pull Request to implement data-specific logic (such as validation, lowercase-ing of the email address, etc.).