Create resolvers and controllers for core views (#13624)

Created:
- Services
- Resolvers
- Controllers
- Tests for services
- Integration tests for GraphQL and Rest

Updated the Rest API playground

Added new feature flag `IS_CORE_VIEW_ENABLED`

Updated `viewFilter` `operand` and `view` `type` to be enums rather than
strings and generated migration file.

Closes https://github.com/twentyhq/core-team-issues/issues/1259

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.spec.ts

@@ -135,6 +135,7 @@ describe('WorkspaceEntityManager', () => {
         IS_RELATION_CONNECT_ENABLED: false,
         IS_FIELDS_PERMISSIONS_ENABLED: false,
         IS_CORE_VIEW_SYNCING_ENABLED: false,
+        IS_CORE_VIEW_ENABLED: false,
         IS_TWO_FACTOR_AUTHENTICATION_ENABLED: false,
         IS_WORKSPACE_MIGRATION_V2_ENABLED: false,
         IS_API_KEY_ROLES_ENABLED: false,