Add initial support for bucket lifecycle (#7563)

This PR is based off @sinhaashish's PR for object lifecycle
management, which includes support only for,
- Expiration of object
- Filter using object prefix (_not_ object tags)

N B the code for actual expiration of objects will be included in a
subsequent PR.

cmd/peer-rest-common.go

@@ -43,6 +43,8 @@ const (
 	peerRESTMethodTargetExists             = "targetexists"
 	peerRESTMethodSendEvent                = "sendevent"
 	peerRESTMethodTrace                    = "trace"
+	peerRESTMethodBucketLifecycleSet       = "setbucketlifecycle"
+	peerRESTMethodBucketLifecycleRemove    = "removebucketlifecycle"
 )
 
 const (