btrfs: stripe_alloc: count nocow run lifecycles and stranded stripes in sysfs
Add a stripe_run_stats file beside stripe_park_stats with lifetime
counters for the paths the previous two patches touched, so a test can
show that it exercised them rather than merely passed: private NOCOW
runs opened, claim candidates refused for overlapping a live run, bytes
of whole stripes the scans found stranded behind live runs, and rescans
requested by a freed run to credit its stripes back.
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