add the router key in dubbo.xsd

[CodingSinger]

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[codecov-io]

Codecov Report

Merging #5337 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #5337      +/-   ##
============================================
+ Coverage     61.18%   61.18%   +<.01%     
+ Complexity      424      421       -3     
============================================
  Files           919      919              
  Lines         37517    37520       +3     
  Branches       5462     5462              
============================================
+ Hits          22956    22958       +2     
- Misses        12053    12057       +4     
+ Partials       2508     2505       -3

Impacted Files	Coverage Δ	Complexity Δ
...g/apache/dubbo/config/AbstractReferenceConfig.java	87.5% <100%> (+0.7%)	0 <0> (ø)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0%> (-7.96%)	19% <0%> (-2%)
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0%> (-6.9%)	0% <0%> (ø)
...g/apache/dubbo/rpc/protocol/rest/RestProtocol.java	68.21% <0%> (-3.11%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	66.33% <0%> (-1.99%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-1.32%)	16% <0%> (-1%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <0%> (-0.63%)	29% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	80.52% <0%> (+2.99%)	0% <0%> (ø)	⬇️
...c/main/java/org/apache/dubbo/rpc/RpcException.java	83.33% <0%> (+3.33%)	0% <0%> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	78.94% <0%> (+5.26%)	0% <0%> (ø)	⬇️
... and 2 more

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