Setup an integration test to cover Center management.

Implement tests that covers creation of a new center in different flavors (e.g. only mandatory fields, all fields) and all possible exceptions.

For more details about centers and date formatting see the API documentation.

https://demo.openmf.org/api-docs/apiLive.htm#centers

https://demo.openmf.org/api-docs/apiLive.htm#dates_and_numbers