feat(consumer): remove event if consumer service shutdown

[ShannonDing]

What is the purpose of the change

feat(consumer): remove event if consumer service shutdown

[codecov-io]

Codecov Report

Merging #233 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   52.87%   52.83%   -0.04%     
==========================================
  Files         174      174              
  Lines       10986    10994       +8     
==========================================
  Hits         5809     5809              
- Misses       5177     5185       +8

Impacted Files	Coverage Δ
src/consumer/DefaultMQPushConsumer.cpp	6.4% <0%> (-0.05%)	⬇️
src/consumer/ConsumeMessageConcurrentlyService.cpp	0% <0%> (ø)	⬆️

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