[java20] Fix for identifiers #4209 #4229
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This PR corrects occurrences of
Identifier, which was done incorrectly. As stated in the Spec, Identifier is a "IdentifierChars but not a ReservedKeyword or BooleanLiteral or NullLiteral". But it should include generallyContexualKeyword. Antlr does not have a "not"-operator for parser grammars, so the rule must be refactored as what can be included. AKeywordis a "ReservedKeyword | ContextualKeyword." This PR definescontextualKeywordand subsets, which are used in a couple of places.