fix: multiple twenty orm issues & show an example of use (#5439)

This PR is fixing some issues and adding enhancement in TwentyORM:

- [x] Composite fields in nested relations are not formatted properly
- [x] Passing operators like `Any` in `where` condition is breaking the
query
- [x] Ability to auto load workspace-entities based on a regex path

I've also introduced an example of use for `CalendarEventService`:


https://github.com/twentyhq/twenty/pull/5439/files#diff-3a7dffc0dea57345d10e70c648e911f98fe237248bcea124dafa9c8deb1db748R15

packages/twenty-server/src/utils/is-plain-object.ts

@@ -0,0 +1,9 @@
+export const isPlainObject = <T>(value: T): boolean => {
+  if (Object.prototype.toString.call(value) !== '[object Object]') {
+    return false;
+  }
+
+  const prototype = Object.getPrototypeOf(value);
+
+  return prototype === null || prototype === Object.prototype;
+};