[WIP] Support Send Message Batch

[trandangtri]

Close #19

[codecov]

Codecov Report

Merging #21 into master will decrease coverage by 2.8%.
The diff coverage is 5.88%.

@@             Coverage Diff             @@
##             master     #21      +/-   ##
===========================================
- Coverage     94.41%   91.6%   -2.81%     
- Complexity      116     119       +3     
===========================================
  Files            18      18              
  Lines           519     536      +17     
===========================================
+ Hits            490     491       +1     
- Misses           29      45      +16

Impacted Files	Coverage Δ	Complexity Δ
Service/BaseQueue.php	79.12% <0%> (-16.88%)	23 <3> (+3)
Service/Message.php	100% <100%> (ø)	9 <0> (ø)	⬇️

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