feat(object): add support for bucket policy management

[pypaut]

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Closes #3923.

Release note for CHANGELOG:

Add support for bucket policy management

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.81818% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.28%. Comparing base (b870211) to head (33d2993).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ernal/namespaces/object/v1/custom_bucket_policy.go	79.66%	14 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5985      +/-   ##
==========================================
+ Coverage   49.23%   49.28%   +0.05%     
==========================================
  Files         355      356       +1     
  Lines       84975    85107     +132     
==========================================
+ Hits        41836    41944     +108     
- Misses      41602    41616      +14     
- Partials     1537     1547      +10     

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