[3.0] catch handler.caught() throwable of MultiMessageHandler

[zrlw]

What is the purpose of the change

#8929

[codecov-commenter]

Codecov Report

Merging #8930 (63b6c02) into 3.0 (8e4d9f6) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                3.0    #8930      +/-   ##
============================================
+ Coverage     63.30%   63.32%   +0.01%     
- Complexity      314      315       +1     
============================================
  Files          1182     1182              
  Lines         50199    50202       +3     
  Branches       7511     7511              
============================================
+ Hits          31780    31791      +11     
+ Misses        14945    14939       -6     
+ Partials       3474     3472       -2     

Impacted Files	Coverage Δ
.../dubbo/remoting/transport/MultiMessageHandler.java	66.66% <0.00%> (-13.34%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	56.52% <0.00%> (-8.70%)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	68.42% <0.00%> (-5.27%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	76.72% <0.00%> (-1.46%)	⬇️
...n/java/org/apache/dubbo/common/utils/NetUtils.java	68.70% <0.00%> (-0.33%)	⬇️
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	79.72% <0.00%> (+0.34%)	⬆️
...ting/zookeeper/curator/CuratorZookeeperClient.java	72.81% <0.00%> (+1.45%)	⬆️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	88.57% <0.00%> (+1.90%)	⬆️
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	71.96% <0.00%> (+2.80%)	⬆️
...he/dubbo/remoting/transport/netty/NettyServer.java	73.68% <0.00%> (+3.50%)	⬆️
... and 2 more

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[changfubai]

LGTM.