optimize generic invoke

[nzomkxia]

add a new generic type "raw.return" to reduce unnecessary result convert. effective for hessian serialization only

[codecov-io]

Codecov Report

Merging #4076 into master will decrease coverage by 0.03%.
The diff coverage is 28.57%.

@@             Coverage Diff              @@
##             master    #4076      +/-   ##
============================================
- Coverage     62.99%   62.95%   -0.04%     
  Complexity      544      544              
============================================
  Files           756      756              
  Lines         32578    32583       +5     
  Branches       5163     5166       +3     
============================================
- Hits          20523    20514       -9     
- Misses         9694     9704      +10     
- Partials       2361     2365       +4

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/apache/dubbo/rpc/filter/GenericFilter.java	48.14% <25%> (-1.86%)	0 <0> (ø)
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	70.37% <33.33%> (-1.63%)	0 <0> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	71.42% <0%> (-2.73%)	0% <0%> (ø)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
.../dubbo/remoting/etcd/jetcd/JEtcdClientWrapper.java	19.49% <0%> (-1.26%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	67.92% <0%> (+0.94%)	0% <0%> (ø)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (+4.34%)	0% <0%> (ø)	⬇️

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[chickenlj]

I think we need a precedent release of hessian-lite, right?

[nzomkxia]

I think we need a precedent release of hessian-lite, right?

hessian-lite 3.2.6 has been released

[CLAassistant]

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[chickenlj]

https://sq.163yun.com/blog/article/185512233177817088

[chickenlj]

This optimization only works for hessian2 serialization:

1. Generic server serializes pojo directly into the pipeline (contains class description info, save the time of converting pojo to map and then serialize map).
2. Generic client deserializes raw bytes, hessian will fail not recognizing the class declared in the data and failover to MapDeserializer.