Allow validation of ConfigurationOptions in RulesetMetadata

Ruleset metadata may contain a list of ConfigOptions of given ruleset.
That would make it easier to sort the options in UI.
This information could be associated automatically, but:

The ruleset metadata class could implement a validation method. Options are often validated together, conditionally.

@Ruleset( id = ..., options = {ScanPackagesOption.class, SourceModeOption.class}
public class JavaRulesetMetadata implements RulesetMetadata {
    @Override ValidationResult validateOptions(WindupConfig wc) {
         ...
     }
}