Add ability to fetch metrics/rollouts/distributions on CLI

[manveerxyz]

Note

Adds RL monitoring and introspection

• New CLI subcommands under prime rl: get, metrics, rollouts, progress, distributions; outputs JSON for easy piping
• API client (api/rl.py) adds: get_run, get_metrics, get_rollouts, get_progress, get_distributions

CLI UX improvements

• list command extracted to _list_runs_impl; adds alias ls and JSON support retained
• Adds rich_help_panel grouping for run, models, list/ls, get, stop, delete, logs, init, metrics, rollouts, progress, distributions
• lab Typer now no_args_is_help=True; main CLI registers rl and lab under Lab

Other

• Minor output/wording tweaks in run details and init help; logs command categorized under "Monitoring"

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[JannikSt]

could technically also add a nice tui and similar to other commands work with proper --output flag