add short/byte data type support for PojoUtils#getDefaultValue

[horizonzy]

What is the purpose of the change

close #6550

[AlbumenJ]

LGTM

[codecov-io]

Codecov Report

Merging #6551 (3e7026d) into master (b14e534) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #6551      +/-   ##
============================================
+ Coverage     59.02%   59.08%   +0.05%     
- Complexity      504      508       +4     
============================================
  Files          1028     1028              
  Lines         41515    41519       +4     
  Branches       6019     6037      +18     
============================================
+ Hits          24505    24531      +26     
+ Misses        14235    14214      -21     
+ Partials       2775     2774       -1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/apache/dubbo/common/utils/PojoUtils.java	72.31% <100.00%> (+0.30%)	0.00 <0.00> (ø)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80.00% <0.00%> (-3.34%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	77.77% <0.00%> (-0.86%)	0.00% <0.00%> (ø%)
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.81% <0.00%> (-0.40%)	27.00% <0.00%> (-1.00%)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	42.03% <0.00%> (-0.17%)	0.00% <0.00%> (ø%)
...che/dubbo/common/compiler/support/JdkCompiler.java	63.20% <0.00%> (ø)	0.00% <0.00%> (ø%)
...apache/dubbo/common/extension/ExtensionLoader.java	75.56% <0.00%> (+0.22%)	0.00% <0.00%> (ø%)
...ubbo/registry/client/ServiceDiscoveryRegistry.java	27.84% <0.00%> (+0.63%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	89.52% <0.00%> (+0.95%)	17.00% <0.00%> (+1.00%)
...ache/dubbo/common/compiler/support/ClassUtils.java	50.26% <0.00%> (+1.04%)	0.00% <0.00%> (ø%)
... and 7 more

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