feat(rdb): support per-rule descriptions in acl add

[jremy42]

close #3754

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.33962% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.48%. Comparing base (6fd860d) to head (3e49e37).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/namespaces/rdb/v1/custom_acl.go	94.33%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5017      +/-   ##
==========================================
+ Coverage   57.47%   57.48%   +0.01%     
==========================================
  Files         308      308              
  Lines       67151    67181      +30     
==========================================
+ Hits        38593    38621      +28     
- Misses      27121    27122       +1     
- Partials     1437     1438       +1     

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