[7.x] Add peer recovery planners that take into account available snapshots #76239
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This commit adds a new set of classes that would compute a peer
recovery plan, based on source files + target files + available
snapshots. When possible it would try to maximize the number of
files used from a snapshot. It uses repositories with
use_for_peer_recovery
setting set to true.
It adds a new recovery setting
indices.recovery.use_snapshots
Relates #73496
Backport of #75840