Implement rename folder 3

[Tulsishah]

Description

• Fake bucket implementation for rename folder
• Fix Get folder fake bucket implementation(It was not returning error if folder does not exist)
• Created rename folder test in prefix_bucket_test.
• Fix some TODOs. GetFolder API instead of statObject in prefix_bucket_tests.

Link to the issue in case of a bug fix.

NA

Testing details

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

[codecov]

Codecov Report

Attention: Patch coverage is 6.06061% with 31 lines in your changes missing coverage. Please review.

Project coverage is 71.91%. Comparing base (f5fbf04) to head (7e35f80).
Report is 1 commits behind head on master.

Files	Patch %	Lines
internal/storage/fake/bucket.go	0.00%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2102      +/-   ##
==========================================
- Coverage   72.02%   71.91%   -0.12%     
==========================================
  Files         101      101              
  Lines       11000    11029      +29     
==========================================
+ Hits         7923     7931       +8     
- Misses       2749     2771      +22     
+ Partials      328      327       -1     

Flag	Coverage Δ
unittests	71.91% <6.06%> (-0.12%)	⬇️

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