Set default proxy to javassist.

[ujjboy]

1. Remove method cache of ReflectUtils.
2. Split ClassUtils#getDefaultArg to getDefaultPrimitiveValue and getDefaultWrapperValue.
3. Set method to SofaRequest when user JavassistProxy.

[codecov-io]

Codecov Report

Merging #79 into master will increase coverage by 0.39%.
The diff coverage is 94.04%.

@@             Coverage Diff              @@
##             master      #79      +/-   ##
============================================
+ Coverage     63.49%   63.88%   +0.39%     
- Complexity      592      596       +4     
============================================
  Files           263      263              
  Lines         11294    11303       +9     
  Branches       1887     1892       +5     
============================================
+ Hits           7171     7221      +50     
+ Misses         3150     3111      -39     
+ Partials        973      971       -2

Impacted Files	Coverage Δ	Complexity Δ
...va/com/alipay/sofa/rpc/message/MessageBuilder.java	88.23% <ø> (ø)	0 <0> (ø)	⬇️
...om/alipay/sofa/rpc/common/json/BeanSerializer.java	66.27% <ø> (ø)	0 <0> (ø)	⬇️
...y/sofa/rpc/bootstrap/DefaultProviderBootstrap.java	60.1% <ø> (-0.21%)	0 <0> (ø)
...com/alipay/sofa/rpc/common/utils/ReflectUtils.java	81.81% <100%> (+20.19%)	0 <0> (ø)	⬇️
...a/com/alipay/sofa/rpc/common/utils/ClassUtils.java	80.27% <100%> (+0.83%)	0 <0> (ø)	⬇️
...lipay/sofa/rpc/proxy/jdk/JDKInvocationHandler.java	73.07% <100%> (-6.09%)	0 <0> (ø)
...lipay/sofa/rpc/proxy/javassist/JavassistProxy.java	79.45% <86.2%> (+4.25%)	0 <0> (ø)	⬇️
...va/com/alipay/sofa/rpc/client/AbstractCluster.java	64.68% <87.5%> (+0.25%)	0 <0> (ø)	⬇️
.../com/alipay/sofa/rpc/log/MiddlewareLoggerImpl.java	76.81% <0%> (-5.8%)	0% <0%> (ø)
...lipay/sofa/rpc/codec/antpb/ProtobufSerializer.java	53.84% <0%> (-2.2%)	17% <0%> (ø)
... and 18 more

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