replication: Simplify mrf requeueing and add backlog handler (#17171)

Simplify MRF queueing and add backlog handler

- Limit re-tries to 3 to avoid repeated re-queueing. Fall offs
to be re-tried when the scanner revisits this object or upon access.

- Change MRF to have each node process only its MRF entries.

- Collect MRF backlog by the node to allow for current backlog visibility

cmd/peer-rest-common.go

@@ -18,7 +18,7 @@
 package cmd
 
 const (
-	peerRESTVersion = "v30" // Removed bloom filter
+	peerRESTVersion = "v31" // Add replication MRF
 
 	peerRESTVersionPrefix = SlashSeparator + peerRESTVersion
 	peerRESTPrefix        = minioReservedBucketPath + "/peer"
@@ -76,6 +76,7 @@ const (
 	peerRESTMethodDevNull                     = "/devnull"
 	peerRESTMethodNetperf                     = "/netperf"
 	peerRESTMethodMetrics                     = "/metrics"
+	peerRESTMethodGetReplicationMRF           = "/getreplicationmrf"
 )
 
 const (