Epic: Improved Local Dev Experience

[apburnes]

Improve the local development experience by implementing resources that can run locally to mock and mimic cloud services.

Tasks

Beta Give feedback

1. [WIP] Add localstack and cf-mock for local development #4349
   +0
2. Add mock email service to support invite user flow and other email notifications locally
3. Create a mature cf-mock to replace Pages core mock tests and projects beyond Pages core.
4. Rewrite dev data creation to create all of AWS/CF/DB resources simultaneously rather than linking them in a fragile fashion
5. Support Add site* , Site build*, and Remove site* locally
6. Create seed data