Sub-orchestration support

[kaibocai]

The SDK should support orchestration to call sub-orchestration

end-to-end example

  it("should be able to use the sub-orchestration", async () => {
    let activityCounter = 0;

    const increment = (ctx: ActivityContext, _: any) => {
      activityCounter++;
    };

    const orchestratorChild: TOrchestrator = async function* (ctx: OrchestrationContext, activityCount: number): any {
      yield ctx.callActivity(increment);
    };

    const orchestratorParent: TOrchestrator = async function* (ctx: OrchestrationContext, count: number): any {
      // Call sub-orchestration
      yield ctx.callSubOrchestrator(orchestratorChild)

    };

    taskHubWorker.addActivity(increment);
    taskHubWorker.addOrchestrator(orchestratorChild);
    taskHubWorker.addOrchestrator(orchestratorParent);
    await taskHubWorker.start();

    const id = await taskHubClient.scheduleNewOrchestration(orchestratorParent, 10);
    const state = await taskHubClient.waitForOrchestrationCompletion(id, undefined, 30);

    expect(state);
    expect(state?.runtimeStatus).toEqual(OrchestrationStatus.ORCHESTRATION_STATUS_COMPLETED);
    expect(state?.failureDetails).toBeUndefined();
    expect(activityCounter).toEqual(1);
  }, 31000);

Tested on local, already support.

Reference: #4