Add basic bandwidth monitoring for replication. (#10501)

This change tracks bandwidth for a bucket and object

- [x] Add Admin API
- [x] Add Peer API
- [x] Add BW throttling
- [x] Admin APIs to set replication limit
- [x] Admin APIs for fetch bandwidth

cmd/peer-rest-common.go

@@ -57,10 +57,12 @@ const (
 	peerRESTMethodListen                = "/listen"
 	peerRESTMethodLog                   = "/log"
 	peerRESTMethodGetLocalDiskIDs       = "/getlocaldiskids"
+	peerRESTMethodGetBandwidth          = "/bandwidth"
 )
 
 const (
 	peerRESTBucket      = "bucket"
+	peerRESTBuckets     = "buckets"
 	peerRESTUser        = "user"
 	peerRESTGroup       = "group"
 	peerRESTUserTemp    = "user-temp"