Example code for query, but with an attribute_exists() in Node.js

Need an example code, with the JS v3 AWS SDK, for node.js that uses the Query operation is an example of the attribute_exists() function in a Condition Expression. The file should live in DynamoDB-SDK-Examples/node.js/WorkingWithQueries/

Use DynamoDB-SDK-Examples/node.js/WorkingWithQueries/ as the entry point and review its existing examples before adding the requested case. The work is complete when that directory contains a Node.js example using the JS v3 AWS SDK, the Query operation, and an attribute_exists() condition expression.

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