feat: Add vfolder move-file API

[achimnol]

refs lablup/backend.ai#385

[codecov]

Codecov Report

Merging #548 (336e206) into main (61a3f10) will increase coverage by 0.05%.
The diff coverage is 14.28%.

❗ Current head 336e206 differs from pull request most recent head 3a6ee58. Consider uploading reports for the commit 3a6ee58 to get more accurate results

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
+ Coverage   48.98%   49.04%   +0.05%     
==========================================
  Files          54       54              
  Lines        9059     9066       +7     
==========================================
+ Hits         4438     4446       +8     
+ Misses       4621     4620       -1     

Impacted Files	Coverage Δ
src/ai/backend/manager/models/storage.py	43.67% <14.28%> (-1.37%)	⬇️
src/ai/backend/manager/server.py	61.57% <0.00%> (+1.84%)	⬆️

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