Make java:S2047 customizable

Rules such as java:S3577 (requiring one of a set of prefixes or suffixes on a test class name) have a format field (regex) that can be customized for each quality profile. Rule S2047, which requires methods returning boolean to start with ‘is’ or ‘has’, would benefit from this feature. Some style guides expand this list to include modals such as ‘can’ and ‘should’ – indeed, any verb combination of words which implies a true or false condition could be acceptable.

Actually, looking at the rule more closely, I see that they only check for rules that start with ‘get’ (presumably a getter) and don’t actually look for is or has – that’s just a suggestion.