Merge 3.x

[cvictory]

support configcenter config and refactor ConfigPostProcessor

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@fa6a6b2). Click here to learn what that means.
The diff coverage is 72.39%.

@@            Coverage Diff            @@
##             master    #5579   +/-   ##
=========================================
  Coverage          ?   61.19%           
  Complexity        ?      424           
=========================================
  Files             ?      923           
  Lines             ?    37583           
  Branches          ?     5437           
=========================================
  Hits              ?    22998           
  Misses            ?    12095           
  Partials          ?     2490

Impacted Files	Coverage Δ	Complexity Δ
.../org/apache/dubbo/rpc/model/ServiceDescriptor.java	91.17% <ø> (ø)	0 <0> (?)
...java/org/apache/dubbo/rpc/model/ConsumerModel.java	50% <ø> (ø)	0 <0> (?)
...n/java/org/apache/dubbo/event/EventDispatcher.java	66.66% <ø> (ø)	0 <0> (?)
...main/java/org/apache/dubbo/event/GenericEvent.java	100% <ø> (ø)	0 <0> (?)
...libaba/dubbo/rpc/protocol/dubbo/FutureAdapter.java	6.81% <ø> (ø)	0 <0> (?)
...ain/java/org/apache/dubbo/event/EventListener.java	86.36% <ø> (ø)	0 <0> (?)
...a/org/apache/dubbo/rpc/service/GenericService.java	0% <ø> (ø)	0 <0> (?)
...org/apache/dubbo/rpc/service/GenericException.java	37.5% <ø> (ø)	0 <0> (?)
...o/common/extension/AdaptiveClassCodeGenerator.java	94.95% <ø> (ø)	0 <0> (?)
...a/org/apache/dubbo/config/ConfigPostProcessor.java	0% <ø> (ø)	0 <0> (?)
... and 138 more

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[chickenlj]

LGTM.