add "save stocker"

src/idz/decoder/saveStocker.ts

@@ -0,0 +1,12 @@
+import { RequestCode } from "../defs";
+import { SaveStockerRequest } from "../request/saveStocker";
+
+saveStocker.msgCode = 0x00a6 as RequestCode;
+saveStocker.msgLen = 0x00c0;
+
+export function saveStocker(buf: Buffer): SaveStockerRequest {
+  return {
+    type: "save_stocker_req",
+    profileId: buf.readUInt32LE(0x0004),
+  };
+}