Refactor error-handler module

[terrymanu]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2345 (6c79646) into master (f0c6852) will decrease coverage by 4.92%.
Report is 72 commits behind head on master.
The diff coverage is 83.87%.

@@             Coverage Diff              @@
##             master    #2345      +/-   ##
============================================
- Coverage     85.04%   80.12%   -4.92%     
+ Complexity     1237     1113     -124     
============================================
  Files           215      204      -11     
  Lines          3984     3824     -160     
  Branches        454      445       -9     
============================================
- Hits           3388     3064     -324     
- Misses          390      570     +180     
+ Partials        206      190      -16     

Files	Coverage Δ
...hardingsphere/elasticjob/api/JobConfiguration.java	72.00% <100.00%> (ø)
...re/elasticjob/spi/listener/ElasticJobListener.java	0.00% <ø> (ø)
...lasticjob/spi/listener/param/ShardingContexts.java	10.00% <ø> (ø)
.../elasticjob/bootstrap/type/OneOffJobBootstrap.java	47.36% <ø> (ø)
...lasticjob/bootstrap/type/ScheduleJobBootstrap.java	0.00% <ø> (ø)
...lk/DingtalkJobErrorHandlerPropertiesValidator.java	100.00% <100.00%> (ø)
.../handler/dingtalk/DingtalkPropertiesConstants.java	0.00% <ø> (ø)
...cjob/error/handler/email/EmailJobErrorHandler.java	92.30% <ø> (ø)
...email/EmailJobErrorHandlerPropertiesValidator.java	100.00% <100.00%> (ø)
.../error/handler/email/EmailPropertiesConstants.java	66.66% <ø> (ø)
... and 96 more

... and 14 files with indirect coverage changes

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