Worker graceful shutdown

[shivanshgaur]

Using WaitGroup to prevent the exit of broker consumption goroutine when Unix signal is being handled

[codecov]

Codecov Report

Merging #543 into master will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #543      +/-   ##
==========================================
- Coverage   38.01%   37.92%   -0.10%     
==========================================
  Files          32       32              
  Lines        3322     3330       +8     
==========================================
  Hits         1263     1263              
- Misses       1920     1928       +8     
  Partials      139      139              

Impacted Files	Coverage Δ
v1/worker.go	3.39% <0.00%> (-0.07%)	⬇️
v2/worker.go	1.99% <0.00%> (-0.05%)	⬇️

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