add AST term for LeftAssoc and RightAssoc in case you want to serialize them #3668
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The intuition here is that \left-assoc and \right-assoc are syntactic sugar, so the parser implicitly desugars them. However, you may still want to construct instances of these terms if you are construcing a KORE AST that you will later write somewhere using I/O. Thus we create these classes and methods in order to facilitate being able to do so.