DynamoDB does not show table contents, only metadata

## Problem
DynamoDB does not show any table content, only metadata.

In the Explorer of the AWS Toolkit for IntelliJ, I can also see the table contents. This is not the case in the toolkit for VS Code. This drift is very unfortunate, as I would prefer to use VS Code.

## Expected behavior
In the Explorer of the AWS Toolkit for VS Code, not only metadata for DynamoDB is displayed, but also the actual table content.

Start by tracing how the AWS Toolkit for VS Code Explorer renders DynamoDB resources and where it currently stops at metadata. Compare the requested behavior with the DynamoDB table-content view described for the IntelliJ toolkit. Done means the Explorer displays actual table contents as well as metadata, with the relevant behavior covered by the project's tests.

Written by the indexing model from the issue text.