aclfile support

[ncode]

• The behavior of sync is something idiotic if you restart redis fast enough that a new master is not elected and all users get removed, so I'm adding support for aclfile and then it works as expected even after restarts

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 10.34483% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 81.15%. Comparing base (510274c) to head (778b908).

Files	Patch %	Lines
pkg/aclmanager/aclmanager.go	10.34%	24 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #12       +/-   ##
===========================================
- Coverage   93.90%   81.15%   -12.76%     
===========================================
  Files           1        1               
  Lines         164      191       +27     
===========================================
+ Hits          154      155        +1     
- Misses          7       31       +24     
- Partials        3        5        +2     

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