聊天：增加私聊部分逻辑

测试：增加测试脚本，减少socket断开的打印

shared/consts/constModules/chatConst.ts

@@ -0,0 +1,14 @@
+export const MSG_CODE_LEN = 8;
+
+export const MSG_STATUS = {
+    NORMAL: 0,
+    BLOCKED: 1
+}
+
+export const MSG_TYPE = {
+    TEXT: 0,
+    RICH_TEXT: 1,
+    IMG: 2
+}
+
+export const ON_MSG_ROUTE = 'onMessage';