Add Exception handling for unknown elements and unknown types

[Zarquan]

We should catch unknown types and return a NO response with an appropriate message rather than allowing the Exception to bubble up into the response.

[Zarquan]

2024-11-17 11:25:46 WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Could not resolve type id 'urn:enum-value-update' as a subtype of `net.ivoa.calycopis.openapi.model.IvoaAbstractUpdate`: known type ids = [IvoaAbstractUpdate, uri:enum-value-update, uri:integer-delta-update, uri:integer-value-update, uri:string-value-update] (for POJO property 'update')]