Continue-as-new support #6
Description
Requirement
Orchestrations should be able to use the continue-as-new pattern as described here.
One or more integration tests should also be written to exercise the continue-as-new codepath.
Implementation notes
A good starting point for writing an integration test would be to look at the Continue-as-new integration test for .NET Isolated: https://github.com/microsoft/durabletask-dotnet/blob/0998d1719e98c3d340f964d7ee659dc4e2916643/test/DurableTask.Sdk.Tests/OrchestrationPatterns.cs#L404-L432