Changes to Create an opportunity

the response property assigned_to/allOf[#/components/schemas/User]/api_access/scope became nullable for the status 201

added the new oauth enum value to the assigned_to/allOf[#/components/schemas/User]/api_access/auth_type response property for the response status 201

added the new optional request property custom_fields

added the media type application/json for the response with the status 403

added the non-success response with the status 429

added the optional property pipeline/book_ids to the response with the 201 status

removed the invalid_json enum value from the error response property for the response status 400

response property detail list-of-types was narrowed by removing types array from media type application/json of response 400