feature: configurable janitor interval and deletion batch size

[zhenqianz]

[fajrifernanda]

nice, finally janitor is configurable 👍🏼

[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (6b98c0b) 68.37% compared to head (6ca5d1d) 68.38%. Report is 3 commits behind head on master.

Files	Patch %	Lines
server.go	78.57%	2 Missing and 1 partial :warning:
janitor.go	50.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #715   +/-   ##
=======================================
  Coverage   68.37%   68.38%           
=======================================
  Files          27       27           
  Lines        3836     3846   +10     
=======================================
+ Hits         2623     2630    +7     
- Misses        929      931    +2     
- Partials      284      285    +1     

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[hibiken]

@zhenqianz Thank you for creating this PR.

Would you mind updating CHANGELOG file before we merge this?

[zhenqianz]

@hibiken okay, will do

@zhenqianz Thank you for creating this PR.

Would you mind updating CHANGELOG file before we merge this?