[Move Object] Add rename file method in dir layer

[Tulsishah]

Description

• RenameFile function in dir.go file
• Added unit tests for successful rename and source does not exist

Link to the issue in case of a bug fix.

NA

Testing details

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

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.

Project coverage is 76.11%. Comparing base (e7acf94) to head (ec48912).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/fs/inode/base_dir.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2841      +/-   ##
==========================================
+ Coverage   76.03%   76.11%   +0.08%     
==========================================
  Files         118      118              
  Lines       16429    16510      +81     
==========================================
+ Hits        12492    12567      +75     
- Misses       3409     3413       +4     
- Partials      528      530       +2     

Flag	Coverage Δ
unittests	76.11% <85.71%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.