Scenario request: Continue as new with too-frequent signals

[cretz]

Describe the scenario you'd like

Run <workflow-count> workflows where each will wait for of signals to be received, for each received signal, run a local-activity that produce a marker. Each workflow would take to finish (maybe control by local-activity). Once of signal is received, drain the signal channel and continue as new.
Separately, there is a client that keeps sending signals to the workflow (can be a long running activity that started by the workflow), and the time between signals has chance shorter than . This will cause workflow to have chance to fail continue_as_new with "unhandled command".

The variables can be set based on good numbers that stress the environment.