Provide a non-expert mode for the DeviceStatsMonitor

Description & Motivation

The DeviceStatsMonitor currently dumps the entire torch.cuda.memory_stats into the logger. Beginner users might be overwhelmed by the amount of data logged and are confused which metrics matter to maximize their utilization.

Pitch

Make the callback more user-friendly by logging only core metrics like GPU utilization and total memory usage. Provide an expert mode that when enabled logs what we see today.

Alternatives

No response

Additional context

This was proposed by user magical_arjay on our Discord.

cc @borda @awaelchli