refact slicetools.Chunks() -> slices.Chunk()

[mmetc]

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• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 60.67%. Comparing base (95a8b47) to head (ef4e50a). :warning: Report is 113 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/database/alerts.go	71.42%	2 Missing :warning:
pkg/database/decisions.go	0.00%	2 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3650   +/-   ##
=======================================
  Coverage   60.67%   60.67%           
=======================================
  Files         374      374           
  Lines       41318    41307   -11     
=======================================
- Hits        25069    25065    -4     
+ Misses      14176    14171    -5     
+ Partials     2073     2071    -2     

Flag	Coverage Δ
bats	44.75% <60.00%> (-0.02%)	:arrow_down:
unit-linux	34.26% <60.00%> (+0.03%)	:arrow_up:
unit-windows	24.31% <10.00%> (-0.01%)	:arrow_down:

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[mmetc]

the standard library panics if the chunk size is 0, even with an empty slice. so using this PR requires adding at least an in/else to each call because we can't use cmp.Or(size, len(slice))