Adds basic global feature flags (#7459)
* Adds basic feature flag model
* Create router.ts
* WIP
* WIP
* WIP
* WIP
* Emails kill switch
* Adds missing migrations
* Type fix
* Cleanup
* Revert
* Cleanup
* Fixes migration
* Update packages/features/flags/server/utils.ts
Co-authored-by: sean-brydon <55134778+sean-brydon@users.noreply.github.com>
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Co-authored-by: Alex van Andel <me@alexvanandel.com>
Co-authored-by: Peer Richelsen <peeroke@gmail.com>
Co-authored-by: sean-brydon <55134778+sean-brydon@users.noreply.github.com>
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