Add exceptionsToTrace configuration support in @SentinelResource annotation

[beston123]

Describe what this PR does / why we need it

In some scenarios，this resource will be degraded when it throws a specific exception.
So the configuration of exception class that should be traced (blocked), is needed.

Does this pull request fix one issue?

Fixes #540

Describe how you did it

Add the configuration of exception classes that would be traced.

Describe how to verify it

None

Special notes for reviews

None

[codecov-io]

Codecov Report

Merging #543 into master will increase coverage by 1.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #543      +/-   ##
============================================
+ Coverage     37.63%   38.74%   +1.11%     
- Complexity     1100     1216     +116     
============================================
  Files           259      275      +16     
  Lines          8171     8702     +531     
  Branches       1113     1163      +50     
============================================
+ Hits           3075     3372     +297     
- Misses         4697     4900     +203     
- Partials        399      430      +31

Impacted Files	Coverage Δ	Complexity Δ
...a/com/alibaba/csp/sentinel/node/StatisticNode.java	56.17% <0%> (-25.79%)	27% <0%> (-1%)
...slots/block/flow/controller/DefaultController.java	41.66% <0%> (-20.84%)	6% <0%> (ø)
...ibaba/csp/sentinel/eagleeye/EagleEyeLogDaemon.java	30.3% <0%> (-15.16%)	6% <0%> (-2%)
...om/alibaba/csp/sentinel/eagleeye/SyncAppender.java	53.57% <0%> (-14.29%)	5% <0%> (-1%)
...p/sentinel/slots/statistic/metric/ArrayMetric.java	67.37% <0%> (-11.58%)	29% <0%> (+1%)
.../src/main/java/com/alibaba/csp/sentinel/Entry.java	90.9% <0%> (-9.1%)	12% <0%> (ø)
...ba/csp/sentinel/slots/statistic/StatisticSlot.java	52.38% <0%> (-8.74%)	10% <0%> (ø)
.../csp/sentinel/slots/statistic/base/WindowWrap.java	71.42% <0%> (-5.5%)	6% <0%> (+1%)
...ntinel/slots/block/degrade/DegradeRuleManager.java	21.27% <0%> (-5.12%)	7% <0%> (ø)
...sp/sentinel/slots/statistic/data/MetricBucket.java	95.34% <0%> (-4.66%)	23% <0%> (+4%)
... and 48 more

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[sczyh30]

Plz also reformat your code to match Alibaba Java Code Guideline.

[sczyh30]

It seems incorrect. For each exception to trace, it should be:

Suggested change

	if (ex.getClass().isAssignableFrom(exceptionToTrace)) {
	if (exceptionToTrace.isAssignableFrom(ex.getClass())) {

Please be sure to add test cases and run the demo to verify it.

[sczyh30]

Maybe we can move the logic to AbstractSentinelAspectSupport class to support extension for sub-classes. E.g.:

protected void traceException(Throwable ex, SentinelResource annotation)

[sczyh30]

Thanks for contributing. I'll help to update the test cases and refactor code later. Please note that every new feature or enhancement must carry corresponding test cases.

[sczyh30]

Improved in 61c5250