* refactor: define inputs and outputs by separating default and custom fields
* refactor: event type api <-> internal transformers
* refactor: v2 use refactored libraries to transform input and output booking fields
* refactor: dont allow custom slugs with default reserved slugs
* refactor: input service store only specific default system fields
* refactor: atoms display only specific default system fields
* refactor: delete unused system field constants
* fix: tests
* fix: old event types
* fix: imports
* fix: import
* chore: release libraries and use v2 with them
* fix: unit tests
* refactor: push email in case of missing phone
* refactor: satisfies check for event-type locations
