Retrieve all Policies based on provided filters

• name (str or None): Optional. The name of the policy to filter by.
• status (PolicyStatus or None): Optional. The status of the policy to filter by.
• created_by (str or None): Optional. The creator of the policy to filter by.
• dataset_id (str or None): Optional. The ID of the dataset associated with the policy to filter by.
• search (str or None): Optional. Global search term that searches across policy ID, name, and updated_at fields. If both search and specific filters are provided, search takes precedence.

Raises: 500: If there is a server error. 404: If the requested resource is not found. 200: If the operation is successful.