storage acl添加，添加contentLength

src/main/java/com/ycwl/basic/storage/enums/StorageAcl.java

@@ -0,0 +1,18 @@
+package com.ycwl.basic.storage.enums;
+
+public enum StorageAcl {
+    PUBLIC_READ("public-read"),
+    PRIVATE("private"),
+    PUBLIC_READ_WRITE("public-read-write"),
+    AUTHENTICATED_READ("authenticated-read");
+
+    private final String value;
+
+    StorageAcl(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+}