feat: improve BucketAcl: * responses

[coryan]

Add attributes not present in the protos.

Part of the work for #338

[codecov]

Codecov Report

Merging #342 (b5aaf3b) into main (f08f755) will increase coverage by 0.01%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##             main     #342      +/-   ##
==========================================
+ Coverage   92.50%   92.51%   +0.01%     
==========================================
  Files          50       51       +1     
  Lines        7988     8013      +25     
==========================================
+ Hits         7389     7413      +24     
- Misses        599      600       +1     

Flag	Coverage Δ
unittests	92.51% <97.43%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
tests/test_proto2rest.py	92.30% <92.30%> (ø)
testbench/proto2rest.py	98.07% <100.00%> (+0.11%)	⬆️
testbench/rest_server.py	98.64% <100.00%> (-0.02%)	⬇️
tests/test_testbench_bucket.py	99.06% <100.00%> (+0.08%)	⬆️

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