Support setting global rule

[linlinisme]

Does this pull request fix one issue?

Fix: #66

Describe how you did it

1. Global rules support both flow and degrade.
2. The flow and degrade global rules have one and only one rule.
3. Global rules are created with specific resources
4. GlobalManger manages them: create, store, update, and retrieve.
5. When the resource performs flow and degrade check, it will get the rule check through GlobalManager in real time.
6. Global rules and resource rules themselves are superimposed on each other. The resource itself is checked first, and the final check is the global rule.

Describe how to verify it

  Run test cases I offer

Special notes for reviews

 None

[codecov-io]

Codecov Report

Merging #956 into master will increase coverage by 0.84%.
The diff coverage is 74.46%.

@@             Coverage Diff              @@
##             master     #956      +/-   ##
============================================
+ Coverage     42.61%   43.45%   +0.84%     
- Complexity     1442     1476      +34     
============================================
  Files           310      313       +3     
  Lines          8985     9055      +70     
  Branches       1222     1237      +15     
============================================
+ Hits           3829     3935     +106     
+ Misses         4687     4639      -48     
- Partials        469      481      +12

Impacted Files	Coverage Δ	Complexity Δ
...sp/sentinel/slots/block/global/GlobalRuleType.java	100% <100%> (ø)	1 <1> (?)
...csp/sentinel/slots/block/flow/FlowRuleChecker.java	52.5% <100%> (+2.5%)	24 <0> (+3)	⬆️
.../csp/sentinel/slots/block/degrade/DegradeRule.java	88.46% <100%> (+16.66%)	27 <0> (+3)	⬆️
...om/alibaba/csp/sentinel/config/SentinelConfig.java	58.9% <100%> (+1.15%)	14 <0> (ø)	⬇️
.../sentinel/slots/block/global/GlobalRuleConfig.java	50% <50%> (ø)	1 <1> (?)
...sentinel/slots/block/global/GlobalRuleManager.java	71.42% <71.42%> (ø)	5 <5> (?)
...ntinel/slots/block/degrade/DegradeRuleManager.java	49.49% <73.07%> (+27.61%)	21 <10> (+12)	⬆️
...ava/com/alibaba/csp/sentinel/node/ClusterNode.java	95.23% <0%> (-4.77%)	7% <0%> (-1%)
.../slots/block/flow/controller/WarmUpController.java	78.84% <0%> (-3.85%)	10% <0%> (-1%)
...a/csp/sentinel/slots/statistic/base/LeapArray.java	70.29% <0%> (ø)	34% <0%> (ø)	⬇️
... and 11 more

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[sczyh30]

👍 I'll take a look these days :)