os/bluestore: show some additional osd/pool stats on fsck completion.

[ifed01]

Sometime we might want to learn actual OSD utilization by means alternative to regular stats reporting.
This patch enables such an accounting during fsck.
E.g. this could be helpful to investigate stats reporting discrepancies or something.
Relevant log output looks like the following:

... 2 bluestore(dev/osd0) _fsck_on_open Per-pool stats:
... 2 bluestore(dev/osd0) _fsck_on_open pool -1 -> (58 objects, 0 shared blobs, 278 omaps, 6798 bytes in omap keys, 52863 bytes in omap vals, 70038 bytes stored, 229376 bytes allocated)
... 2 bluestore(dev/osd0) _fsck_on_open pool 1 -> (3 objects, 0 shared blobs, 0 omaps, 0 bytes in omap keys, 0 bytes in omap vals, 459280 bytes stored, 462848 bytes allocated)
... 2 bluestore(dev/osd0) _fsck_on_open pool 2 -> (44 objects, 0 shared blobs, 0 omaps, 0 bytes in omap keys, 0 bytes in omap vals, 0 bytes stored, 0 bytes allocated)
... 1 bluestore(dev/osd0) _fsck_on_open <<<FINISH>>> with 0 errors, 0 warnings, 0 repaired, 0 remaining in 0.039815 seconds

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[github-actions]

This pull request has been automatically marked as stale because it has not had any activity for 60 days. It will be closed if no further activity occurs for another 30 days.
If you are a maintainer or core committer, please follow-up on this pull request to identify what steps should be taken by the author to move this proposed change forward.
If you are the author of this pull request, thank you for your proposed contribution. If you believe this change is still appropriate, please ensure that any feedback has been addressed and ask for a code review.

[yuriw]

This PR is under test in https://tracker.ceph.com/issues/65798.

[NitzanMordhai]

Rados approved: https://tracker.ceph.com/projects/rados/wiki/MAIN#httpstrackercephcomissues65798