[Dubbo-4984]Fix: type definition for String class

[Moriadry-zz]

What is the purpose of the change

Fix #4984

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #5032 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #5032      +/-   ##
============================================
- Coverage     63.95%   63.95%   -0.01%     
- Complexity      451      452       +1     
============================================
  Files           769      769              
  Lines         33182    33184       +2     
  Branches       5232     5233       +1     
============================================
  Hits          21222    21222              
- Misses         9541     9543       +2     
  Partials       2419     2419

Impacted Files	Coverage Δ	Complexity Δ
...bbo/metadata/definition/TypeDefinitionBuilder.java	93.1% <100%> (+0.51%)	0 <0> (ø)	⬇️
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	63.63% <0%> (-1.14%)	0% <0%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <0%> (-0.63%)	29% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (ø)	0% <0%> (ø)	⬇️
...he/dubbo/remoting/transport/netty/NettyServer.java	73.21% <0%> (+3.57%)	9% <0%> (+1%)	⬆️
...mmon/threadpool/support/AbortPolicyWithReport.java	89.18% <0%> (+5.4%)	0% <0%> (ø)	⬇️

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[htynkn]

@lexburner This is PR for #4984, could you help on reviewing it?

[lexburner]

LGTM