Refactored and improved seeds (#8695)

- Added a new Seeder service to help with custom object seeds
- Added RichTextFieldInput to edit a rich text field directly on the
table, but deactivated it for now.

packages/twenty-front/src/utils/parseJson.ts

@@ -0,0 +1,13 @@
+import { isDefined } from 'twenty-ui';
+
+export const parseJson = <T>(json: string | undefined | null) => {
+  if (!isDefined(json)) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(json) as T;
+  } catch (e) {
+    return null;
+  }
+};