Core: Adding additional information in RestException

[masfworld]

There are scenarios where there are RESTException issues but the message is providing value. For instance:

org.apache.iceberg.exceptions.RESTException: Unable to process: \n\tat
org.apache.iceberg.rest.ErrorHandlers$DefaultErrorHandler.accept(ErrorHandlers.java:250)\n\tat
org.apache.iceberg.rest.ErrorHandlers$TableErrorHandler.accept(ErrorHandlers.java:124)\n\tat
org.apache.iceberg.rest.ErrorHandlers$TableErrorHandler.accept(ErrorHandlers.java:108)\n\tat

So, the idea is to provide code and type in RESTException to get more context.