Option to create multiple events with readings

Using the current SDK, on AutoEvent schedule, the HandleReadCommands method gets called to create and add reading objects to an event. This, however presupposes that at the appointed schedule, only one event is to be created.

Some devices/sensors, when polled, return the data for multiple events/readings. For example, in some RFID devices, when the RFID reader is pulled, multiple RFID tag events are returned. Each tag event contains what tag was read, the signal strength, reader id, etc.

The SDK should allow for creation of multiple events as well as multiple readings on a single event.

Start with the AutoEvent schedule and its HandleReadCommands method, then trace how readings are added to a single event. Determine the SDK API and lifecycle changes needed to represent multiple events from one poll. Done means a device can return multiple tag events, each containing its corresponding readings, with the relevant behavior covered by tests.

Written by the indexing model from the issue text.