title: Add existing dynamodb table with stream to CDK
body: <p>I currently have a dynamodb table that's been in use for a couple of years, originally created in the console. It contains lots of valuable data. It uses a stream to periodically send a snapshot using a lambda trigger of the table to s3 for analytics. The table itself is heavily used by end users to access their data.</p>
  <p>I want to migrate my solution into CDK. The options I want to explore:</p>
  <ol>
  <li>When you use the Table.fromTableArn construct, you don't get access to the table stream arn so it's impossible to attach a lambda trigger. Is there a way around this?</li>
  <li>Is there a way to clone the dynamoDB table contents in my CDK stack so that my copy will start off in exactly the same state as the original? Then I can add and manage the stream etc in CDK no problem.</li>
  <li>It's worth checking my assumption that these are the only 2 options.</li>
  </ol>