feat: support cancellable sleep

[WqyJh]

If context.Context got timeout or canceled, go routines calling time.Sleep cannot be cancelled, and the following redis calls would fail. Therefore, it's better to support cancellable sleep to make it fail fast.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (3bdca0f) 85.61% compared to head (c3ad74e) 83.00%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
batch.go	52.63%	7 Missing and 2 partials ⚠️
client.go	60.00%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   85.61%   83.00%   -2.61%     
==========================================
  Files           3        3              
  Lines         424      459      +35     
==========================================
+ Hits          363      381      +18     
- Misses         45       58      +13     
- Partials       16       20       +4     

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