feat: add publish and getpubsub for streaming

[FogDong]

Fix #437

This PR adds publish and getPubSub so that users can use publish to stream messages and use getPubSub to receive.

[kamikazechaser]

Thanks for this. From what I can see this is a feature to track tasks via Redis pub/sub. An alternative to ResultWriter.Write.

However this is not really a fix for #437 and looks very unrelated to it (capturing Redis commands). Could you create a new issue and maybe get feedback on it? Nevertheless, this looks like a good feature to have.

[codecov[bot]]

Codecov Report

Merging #736 (40df09c) into master (6b98c0b) will decrease coverage by 0.25%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #736      +/-   ##
==========================================
- Coverage   68.37%   68.12%   -0.25%     
==========================================
  Files          27       27              
  Lines        3836     3850      +14     
==========================================
  Hits         2623     2623              
- Misses        929      943      +14     
  Partials      284      284              

Files Changed	Coverage Δ
asynq.go	66.66% <0.00%> (-2.13%)	:arrow_down:
inspector.go	60.27% <0.00%> (-0.43%)	:arrow_down:
internal/base/base.go	70.18% <ø> (ø)
internal/rdb/rdb.go	73.36% <0.00%> (-0.92%)	:arrow_down:

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