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/core-modules/open-api/open-api.service.ts

@@ -196,6 +196,30 @@ export class OpenApiService {
         nameSingular: 'apiKey',
         namePlural: 'apiKeys',
       },
+      {
+        nameSingular: 'view',
+        namePlural: 'views',
+      },
+      {
+        nameSingular: 'viewField',
+        namePlural: 'viewFields',
+      },
+      {
+        nameSingular: 'viewFilter',
+        namePlural: 'viewFilters',
+      },
+      {
+        nameSingular: 'viewSort',
+        namePlural: 'viewSorts',
+      },
+      {
+        nameSingular: 'viewGroup',
+        namePlural: 'viewGroups',
+      },
+      {
+        nameSingular: 'viewFilterGroup',
+        namePlural: 'viewFilterGroups',
+      },
     ];
 
     schema.paths = metadata.reduce((path, item) => {