增加Agent通知逻辑

[hanbingleixue]

【修复issue】#1231

【修改内容】
1、增加AgentCore事件通知

【用例描述】
1、已增加UT

【自测情况】
1、本地静态检查通过
2、自测通过

【影响范围】
1、对用户的使用存在影响，后续增加用户使用手册。

[codecov]

Codecov Report

Patch coverage: 40.00% and project coverage change: +0.11 🎉

Comparison is base (925b052) 41.65% compared to head (aa851ca) 41.77%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1232      +/-   ##
=============================================
+ Coverage      41.65%   41.77%   +0.11%     
- Complexity      3204     3226      +22     
=============================================
  Files            811      817       +6     
  Lines          17939    18029      +90     
  Branches        1952     1960       +8     
=============================================
+ Hits            7473     7532      +59     
- Misses          9530     9551      +21     
- Partials         936      946      +10     

Flag	Coverage Δ
unittests	41.77% <40.00%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...om/huaweicloud/sermant/core/AgentCoreEntrance.java	0.00% <0.00%> (ø)
...ant/core/notification/SermantNotificationType.java	0.00% <0.00%> (ø)
...t/core/notification/ZookeeperNotificationType.java	0.00% <0.00%> (ø)
...mant/implement/service/send/netty/NettyClient.java	1.08% <0.00%> (-0.09%)	⬇️
...namicconfig/zookeeper/ZooKeeperBufferedClient.java	33.33% <25.00%> (-0.53%)	⬇️
...ud/sermant/core/notification/NotificationInfo.java	41.66% <41.66%> (ø)
...sermant/core/notification/NotificationManager.java	58.06% <58.06%> (ø)
...rmant/core/notification/NettyNotificationType.java	77.77% <77.77%> (ø)
...t/core/notification/config/NotificationConfig.java	100.00% <100.00%> (ø)

... and 18 files with indirect coverage changes

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