adds get folder method in bucket.go

[ankitaluthra1]

Description

integrates with get folder method of control client for all buckets (except fast stat bucket - next PR).
it is not called from anywhere, hence no change in existing functionality.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - Done
2. Unit tests - Done
3. Integration tests - NA

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 40 lines in your changes missing coverage. Please review.

Project coverage is 72.28%. Comparing base (5eaf517) to head (52af2bd).
Report is 5 commits behind head on master.

Files	Patch %	Lines
internal/storage/mock_bucket.go	0.00%	15 Missing ⚠️
internal/ratelimit/throttled_bucket.go	0.00%	6 Missing ⚠️
internal/monitor/bucket.go	0.00%	5 Missing ⚠️
internal/storage/caching/fast_stat_bucket.go	0.00%	5 Missing ⚠️
internal/storage/debug_bucket.go	0.00%	5 Missing ⚠️
internal/storage/fake/bucket.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2041      +/-   ##
==========================================
+ Coverage   71.55%   72.28%   +0.73%     
==========================================
  Files          98       99       +1     
  Lines       10756    11038     +282     
==========================================
+ Hits         7696     7979     +283     
- Misses       2716     2730      +14     
+ Partials      344      329      -15     

Flag	Coverage Δ
unittests	72.28% <28.57%> (+0.73%)	⬆️

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[Tulsishah]

We should not put internal ticket id externally.
PTAL on that also.

[Tulsishah]

LGTM from my side except few minor changes.