Support Long Timers

[davidmrdavid]

This issue is to support timers longer than 7 days using the [createTimer[(https://docs.microsoft.com/en-us/javascript/api/durable-functions/durableorchestrationcontext?view=azure-node-latest#durable-functions-durableorchestrationcontext-createtimer) API.

An implementation example may be found here: Azure/azure-functions-durable-js#340

Related - Azure/azure-functions-durable-js#325