initial prometheus metrics

[theomonnom]

• multiprocessing & some basic metrics (running jobs, prewarm time)

still draft, needs reported cpu & memory metrics before merging. Assistant stats will use another protocol

[changeset-bot[bot]]

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Latest commit: 2e13a4f6b88f87f931310f5c27f53399fa3e5a6e

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[royatanu94]

@theomonnom Can we use this ? Does this implementation works? TIA