[#1064] putsvc: Add EC put

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/core/object/ec.go

@@ -0,0 +1,13 @@
+package object
+
+import (
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+)
+
+// IsECSupported returns True if EC supported for object.
+//
+// EC supported only for regular, not linking objects.
+func IsECSupported(obj *objectSDK.Object) bool {
+	return obj.Type() == objectSDK.TypeRegular &&
+		len(obj.Children()) == 0
+}