public static FunctionNode ofExpressions(String functionName, ToExpression... arguments) {
        return ofExpressions(functionName, SourceLocation.none(), arguments);
    }
Constructs a {@link FunctionNode} for the given function name and arguments.

@param functionName the function name.
@param arguments zero or more expressions as arguments to the function.
@return the {@link FunctionNode}.
smithy-rules-engine/src/main/java/software/amazon/smithy/rulesengine/language/syntax/expressions/functions/FunctionNode.java