Changes to Search Patient

added the new optional request property filter

added the optional property error_code to the response with the 204 status

added the optional property error_code to the response with the 400 status

added the optional property error_code to the response with the 401 status

added the optional property error_code to the response with the 406 status

added the optional property error_code to the response with the 500 status

added the optional write-only property items/filter to the response with the 200 status