oracle-object-storage: expose the storage_tier option in config

backend/oracleobjectstorage/options.go

@@ -123,6 +123,22 @@ func newOptions() []fs.Option {
 			Value: "Default",
 			Help:  "Use the default profile",
 		}},
+	}, {
+		// Mapping from here: https://github.com/oracle/oci-go-sdk/blob/master/objectstorage/storage_tier.go
+		Name:     "storage_tier",
+		Help:     "The storage class to use when storing new objects in storage. https://docs.oracle.com/en-us/iaas/Content/Object/Concepts/understandingstoragetiers.htm",
+		Default:  "Standard",
+		Advanced: true,
+		Examples: []fs.OptionExample{{
+			Value: "Standard",
+			Help:  "Standard storage tier, this is the default tier",
+		}, {
+			Value: "InfrequentAccess",
+			Help:  "InfrequentAccess storage tier",
+		}, {
+			Value: "Archive",
+			Help:  "Archive storage tier",
+		}},
 	}, {
 		Name: "upload_cutoff",
 		Help: `Cutoff for switching to chunked upload.