util-dynamodb doesn't marshall properties in prototype chain

[trivikr]

Describe the bug

util-dynamodb doesn't marshall properties in prototype chain

Your environment

SDK version number

"@aws-sdk/util-dynamodb": "3.4.0",
"aws-sdk": "2.832.0"

Is the issue in the browser/Node.js/ReactNative?

All

Details of the browser/Node.js/ReactNative version

tested in Node.js v14.15.4

Steps to reproduce

Run the following file:

index.ts

const AWS = require("aws-sdk");
const { marshall } = require("@aws-sdk/util-dynamodb");

(async () => {
  const input = { a: 1, b: 2 };

  console.log(
    "v2 pure object: " + JSON.stringify(AWS.DynamoDB.Converter.marshall(input))
  );
  console.log("v3 pure object: " + JSON.stringify(marshall(input)));

  console.log(
    "v2 object from Object.create(): " +
      JSON.stringify(AWS.DynamoDB.Converter.marshall(Object.create(input)))
  );
  console.log(
    "v3 object from Object.create(): " +
      JSON.stringify(marshall(Object.create(input)))
  );
})();

Observed behavior

The properties a and b from prototype chain are not marshalled in v3.

Output

v2 pure object: {"a":{"N":"1"},"b":{"N":"2"}}
v3 pure object: {"a":{"N":"1"},"b":{"N":"2"}}
v2 object from Object.create(): {"a":{"N":"1"},"b":{"N":"2"}}
v3 object from Object.create(): {}

Expected behavior

The properties from prototype chain are marshalled.

Additional context

Refs: #1861

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