[core] Support NoAttribute for XPath

[adangel]

• This PR is for PMD 7.
• It's extracted from [java] New expression and type grammar #1759

Changes:

• Adds the @net.sourceforge.pmd.lang.ast.xpath.NoAttribute annotation
• With that, you can annotate getters in AST nodes, that should not be exposed as XPath attributes and thus cannot be used for xpath expressions/queries.
• The annotation can also be applied to the whole AST class - then all methods are not exposed.

Todo:

• This feature needs to be documented somewhere... it seems to be part of the AST API -> https://github.com/pmd/pmd/wiki/PMD-7.0.0-API
• We need to add a unit test

[pmd-test]

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[oowekyala]

I added some unit tests. I also changed a bit the contract of @NoAttribute:

• Attributes from Node and AbstractNode are never suppressed. I don't know what might go wrong if we do suppress them.
• The scope INHERITED suppresses the attributes inherited from supertypes
• The scope ALL suppresses the attributes defined in the class + INHERITED
• In any case, if an attribute accessor is overridden in a concrete class C, then it is only suppressed if either
  1. the accessor has its own NoAttribute annotation
  2. C has a @NoAttribute(scope = ALL).

This last point means that if you can override the method, then you can expose it as an attribute again.

[jsotuyod]

@oowekyala anything holding this from being merged?

[oowekyala]

@jsotuyod nope, i might have forgotten about it