add <xs:anyAttribute processContents="skip"/> to DOM type's complexType generated (in xsd generation)

[XenoAmess]

follows discussions in #482

@gnodet please have a look

[Copilot]

Pull Request Overview

This PR adds an <xs:anyAttribute processContents="skip"/> element to the DOM type's complexType in XSD generation. This change allows for additional attributes to be present in XML elements without validation, providing more flexibility in XML schema validation.

• Added xs:anyAttribute element with processContents="skip" to the properties element generation
• Created a new test case for XSD generation with Maven2 model

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
XsdGenerator.java	Adds the anyAttribute element to DOM complexType generation
XsdGeneratorMaven2Test.java	New test class to verify XSD generation functionality

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