Support timeout job

[sunkai-cai]

Fixes #1464

Changes proposed in this pull request:

• add timeout of JobConfiguration
• support timeout for ElasticJobExecutor

[codecov-commenter]

Codecov Report

Merging #1923 (9427640) into master (adcf88c) will decrease coverage by 0.01%.
The diff coverage is 81.48%.

@@             Coverage Diff              @@
##             master    #1923      +/-   ##
============================================
- Coverage     85.66%   85.64%   -0.02%     
  Complexity      114      114              
============================================
  Files           276      276              
  Lines          6026     6048      +22     
  Branches        922      925       +3     
============================================
+ Hits           5162     5180      +18     
- Misses          525      528       +3     
- Partials        339      340       +1     

Impacted Files	Coverage Δ
...sphere/elasticjob/executor/ElasticJobExecutor.java	87.73% <76.19%> (-3.57%)	⬇️
...hardingsphere/elasticjob/api/JobConfiguration.java	74.50% <100.00%> (+1.04%)	⬆️
...re/elasticjob/infra/pojo/JobConfigurationPOJO.java	100.00% <100.00%> (ø)
.../namespace/job/parser/JobBeanDefinitionParser.java	100.00% <100.00%> (ø)
...rdingsphere/elasticjob/infra/json/GsonFactory.java	100.00% <0.00%> (ø)
...ticjob/lite/internal/snapshot/SnapshotService.java	82.53% <0.00%> (+1.58%)	⬆️

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[linghengqian]

• Not sure if I'm asking too late. Should this PR add documentation?

[linghengqian]

• I rebase the relevant branch, but it seems that some unit tests timeout.

[sunkai-cai]

Maybe this is not a good design。 We need redesign it if we need the timeout features。