add ring_members_by_zone metric if ring is zone aware #5718
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What this PR does:
Added ring_members_by_zone metric to ring.
This is helpful when diagnose problems when a quorum in different zones is needed for successful read/write.
Didn't extend existing metric, because it might be used by consumers in their environment already, and adding a new metric here is safer.
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]