Add system metrics (cpu utilization, gpu utilization, memory utilization, etc).

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The work needs to take multiple steps:

• introduce a thread to capture perf regularly Create performance reporting thread for single node components #189
• distinguish between single node and multi node modules Create distinct class for single node and multi node, with shared utility functions #188
• implement mpi communication to report all per-node training metrics in node 0 Communicate all lightgbm distributed metrics into node 0 for surfacing as aggregate #185
• implement thread in all modules Adding perf metrics to each node in both single and multi node scripts #192