@Override
        public Void visitLiteral(LiteralExpression expression) {
            // e.g.: `[true]`
            visitLiteral(expression, false);
            return null;
        }
Serialize the given JMESPath expression to a string.

@param expression JMESPath expression to serialize.
@return Returns the serialized expression.
smithy-jmespath/src/main/java/software/amazon/smithy/jmespath/ExpressionSerializer.java