Process XSD Validation Messages in the same way as RiseClipse Messages

[dlabordus]

User Story

Process the XSD Validation Message like the RiseClipse message in a more structured way.
The RiseClipse message are split into RuleName, Linenumber and Message.
This can also be done for the XSD Message. The RuleName will always be 'XSD Validation'.
The Message and Linenumber can be retrieved from the SAX Parser Exception.

Maybe also extend the ValidationError with a variable (long) 'ColumnNumber' to also show this in OpenSCD.
If done, this also should be processed in the frontend, to be shown.

Acceptance criteria

The response message from the XSD should also be split into separate parts.