support generic invoke for http/hessian protocol #1768

[diecui1202]

What is the purpose of the change

The corresponding issue is #1768. This PR support generic invocation in HttpProtocol/HessianProtocol.

Brief changelog

To export additional GenericService in HessianProtocol/HttpProtocol for supporting normal/nativejava/bean types of generic invocation.

Verifying this change

HttpProtocolTest/HessianProtocolTest is the corresponding unit tests.

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[codecov-io]

Codecov Report

Merging #1801 into master will decrease coverage by 0.08%.
The diff coverage is 73.25%.

@@             Coverage Diff              @@
##             master    #1801      +/-   ##
============================================
- Coverage     40.43%   40.34%   -0.09%     
- Complexity     4415     4443      +28     
============================================
  Files           628      643      +15     
  Lines         30082    30533     +451     
  Branches       5319     5379      +60     
============================================
+ Hits          12164    12320     +156     
- Misses        15994    16279     +285     
- Partials       1924     1934      +10

Impacted Files	Coverage Δ	Complexity Δ
...bbo/rpc/proxy/wrapper/StubProxyFactoryWrapper.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...va/com/alibaba/dubbo/rpc/filter/GenericFilter.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../alibaba/dubbo/rpc/proxy/AbstractProxyFactory.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...om/alibaba/dubbo/rpc/filter/GenericImplFilter.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...baba/dubbo/rpc/protocol/AbstractProxyProtocol.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ocol/hessian/DubboHessianURLConnectionFactory.java	100% <100%> (ø)	3 <3> (?)
...ba/dubbo/rpc/protocol/hessian/HessianProtocol.java	68.29% <100%> (+8.91%)	10 <5> (+3)	⬆️
.../dubbo/rpc/protocol/http/HttpRemoteInvocation.java	100% <100%> (ø)	3 <3> (?)
.../protocol/hessian/HttpClientConnectionFactory.java	45.45% <50%> (-4.55%)	2 <1> (ø)
...ing/transport/dispatcher/ChannelEventRunnable.java	80.85% <66.66%> (+3.76%)	9 <4> (ø)	⬇️
... and 22 more

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[diecui1202]

I haven't find the way to ship context from consumer to provider through HessianProxyFactory. An ugly way is to use URL query parameter, but it has a length limit.

[diecui1202]

Another way is using HTTP Header to ship RpcContext. I will try it later.

[diecui1202]

Because of the commits are not clear, so I'll start a new PR, this one will be closed.

[diecui1202]

The new PR is #1827