title: Cannot find HttpApi construct in CDK v2
body: <p>I'm trying to add an HttpApi to my project that already uses CDK v2.
  I'm able to retrieve the HttpApi class from <code>@aws-cdk/aws-apigatewayv2</code>:</p>
  <p><a href="https://docs.aws.amazon.com/cdk/api/v1/docs/@aws-cdk_aws-apigatewayv2.HttpApi.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/cdk/api/v1/docs/@aws-cdk_aws-apigatewayv2.HttpApi.html</a></p>
  <p>But I'm not able to retrieve the construct in the new v2 <code>aws-cdk-lib</code> module:</p>
  <p><a href="https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigatewayv2-readme.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigatewayv2-readme.html</a></p>
  <p>Has the package been moved in v2?</p>
  <p>Also, what is the difference between HttpApi and this <a href="https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sam.CfnHttpApi.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sam.CfnHttpApi.html</a>?</p>
  <p>Thanks :)</p>