修改事件过期时间单位和webhook通知级别

[xuezechao1]

【修复issue】#1099

【修改内容】

• 事件过期时间单位由秒更改为天，默认保存7天
• 事件webhook通知级别更改为EMERGENCY

【用例描述】不需修改用例

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (4fa3593) 42.18% compared to head (0a6d3c6) 42.17%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1185      +/-   ##
=============================================
- Coverage      42.18%   42.17%   -0.01%     
+ Complexity      3227     3226       -1     
=============================================
  Files            812      812              
  Lines          17917    17917              
  Branches        1948     1948              
=============================================
- Hits            7558     7557       -1     
- Misses          9412     9413       +1     
  Partials         947      947              

Flag	Coverage Δ
unittests	42.17% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...d/sermant/backend/dao/memory/MemoryClientImpl.java	0.00% <0.00%> (ø)
...oud/sermant/backend/dao/redis/RedisClientImpl.java	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[robotLJW]

/lgtm