adm: add storage load inspection command

[carpawell]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 10.34483% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.33%. Comparing base (9496305) to head (56bc1e8).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/neofs-adm/internal/modules/fschain/load.go	0.00%	52 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3649      +/-   ##
==========================================
- Coverage   27.38%   27.33%   -0.05%     
==========================================
  Files         657      658       +1     
  Lines       41271    41329      +58     
==========================================
- Hits        11300    11299       -1     
- Misses      28915    28972      +57     
- Partials     1056     1058       +2     

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[cthulhu-rider]

@carpawell lets fix CL and merge