[Dubbo-3707] Merge dubbo-serialization-gson into incubator-dubbo

[tswstarplanet]

What is the purpose of the change

#3707

Brief changelog

XXXXX

Verifying this change

XXXXX

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[tswstarplanet]

I have run the unit test, and write a demo to test the new module

[codecov-io]

Codecov Report

Merging #3714 into master will decrease coverage by 0.05%.
The diff coverage is 92.3%.

@@             Coverage Diff              @@
##             master    #3714      +/-   ##
============================================
- Coverage     63.67%   63.62%   -0.06%     
  Complexity       71       71              
============================================
  Files           709      712       +3     
  Lines         31378    31443      +65     
  Branches       5071     5072       +1     
============================================
+ Hits          19981    20005      +24     
- Misses         9105     9141      +36     
- Partials       2292     2297       +5

Impacted Files	Coverage Δ	Complexity Δ
...dubbo/common/serialize/gson/GsonSerialization.java	100% <100%> (ø)	0 <0> (?)
...bo/common/serialize/gson/GsonJsonObjectOutput.java	100% <100%> (ø)	0 <0> (?)
...bbo/common/serialize/gson/GsonJsonObjectInput.java	80% <80%> (ø)	0 <0> (?)
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	64.1% <0%> (-17.95%)	0% <0%> (ø)
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	72.78% <0%> (-3.41%)	0% <0%> (ø)
... and 7 more

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[ralf0131]

Sorry, there is some conflict, I think it is due to the avro serialization has been merged. Could you please resolve the conflict?

[tswstarplanet]

Sorry, there is some conflict, I think it is due to the avro serialization has been merged. Could you please resolve the conflict?

OK, I will resolve the conflict.

[ralf0131]

LGTM, thanks for the pull request.