Frame data example

Frame/time-window grouping of integrated readout payloads.

This example demonstrates how to build a frame container, GFrameDataCollection, that owns:

• one GFrameHeader containing frame ID and duration
• a list of GIntegralPayload objects storing crate, slot, channel, charge, and time

Frames are typically used for streaming/readout-style output where data are grouped by time windows rather than by events. Conceptually, a frame corresponds to a fixed integration window during which many channels may contribute payload.