refactor(worker): remove context from notification structure

[appleboy]

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[codecov-io]

Codecov Report

Merging #503 into master will increase coverage by 0.09%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #503      +/-   ##
==========================================
+ Coverage   82.72%   82.81%   +0.09%     
==========================================
  Files          20       20              
  Lines        1424     1420       -4     
==========================================
- Hits         1178     1176       -2     
+ Misses        193      191       -2     
  Partials       53       53              

Impacted Files	Coverage Δ
gorush/notification.go	100.00% <ø> (ø)
rpc/server.go	22.66% <50.00%> (+1.33%)	⬆️
gorush/worker.go	86.20% <100.00%> (+0.72%)	⬆️

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