Carry the triggered rule in subclasses of BlockException

[sczyh30]

Describe what this PR does / why we need it

Carry the triggered rule in subclasses of BlockException. See #424 for more information.

Does this pull request fix one issue?

Resolves #424

Describe how you did it

Refactor each subclass of BlockException and add a rule field to carry the triggered rule (except the SystemRule). Users can get the trigger rule from the getRule() method.

Describe how to verify it

It's a compatible change. The CI should pass.

Special notes for reviews

NONE

[CarpenterLee]

It seems that moving getRule () method into BlockException is more appropriate.

[CarpenterLee]

LGTM

[sczyh30]

Due to the fact that JLS does not allow generic subclasses of Throwable, I've added the rule field and getRule method in BlockException (rule type as AbstractRule). But in subclasses of BlockException we can ensure the type of the rule in the constructor, so we can override the getRule method and cast it to actual rule type.

[codecov-io]

Codecov Report

Merging #469 into master will increase coverage by 1.6%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##             master     #469     +/-   ##
===========================================
+ Coverage     37.65%   39.25%   +1.6%     
- Complexity      984     1077     +93     
===========================================
  Files           235      236      +1     
  Lines          7434     7713    +279     
  Branches       1018     1085     +67     
===========================================
+ Hits           2799     3028    +229     
- Misses         4274     4294     +20     
- Partials        361      391     +30

Impacted Files	Coverage Δ	Complexity Δ
...ntinel/slots/block/degrade/DegradeRuleManager.java	26.38% <0%> (ø)	7 <0> (ø)	⬇️
...sentinel/slots/block/degrade/DegradeException.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...sp/sentinel/slots/system/SystemBlockException.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...sentinel/slots/block/flow/param/ParamFlowSlot.java	76.78% <100%> (ø)	18 <0> (ø)	⬇️
...libaba/csp/sentinel/slots/block/flow/FlowSlot.java	100% <100%> (ø)	8 <0> (ø)	⬇️
.../sentinel/slots/block/authority/AuthoritySlot.java	88.23% <100%> (ø)	7 <0> (ø)	⬇️
...ibaba/csp/sentinel/slots/block/BlockException.java	54.28% <44.44%> (+15.82%)	8 <1> (+4)	⬆️
...nel/slots/block/flow/param/ParamFlowException.java	42.85% <57.14%> (-19.65%)	3 <1> (ø)
...inel/slots/block/authority/AuthorityException.java	30% <66.66%> (-12.86%)	2 <1> (ø)
...a/csp/sentinel/slots/block/flow/FlowException.java	50% <66.66%> (+7.14%)	3 <1> (+1)	⬆️
... and 20 more

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