draft: flat storage tool

[Longarithm]

Picking up #11013

Command: ./neard-fs-alex --unsafe-fast-startup flat-storage init --shard-id 2 --height 156901187 --target-db-path ~/.near/alex-recovery-data/156901187/2/ --num-threads 8

[codecov]

Codecov Report

Attention: Patch coverage is 0.90090% with 110 lines in your changes are missing coverage. Please review.

Project coverage is 71.03%. Comparing base (02a315a) to head (096c2d5).

Files	Patch %	Lines
tools/flat-storage/src/commands.rs	0.00%	104 Missing ⚠️
core/store/src/db/mixeddb.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11146      +/-   ##
==========================================
- Coverage   71.08%   71.03%   -0.06%     
==========================================
  Files         773      773              
  Lines      154194   154301     +107     
  Branches   154194   154301     +107     
==========================================
- Hits       109615   109605      -10     
- Misses      40134    40247     +113     
- Partials     4445     4449       +4     

Flag	Coverage Δ
backward-compatibility	0.24% <0.00%> (-0.01%)	⬇️
db-migration	0.24% <0.00%> (-0.01%)	⬇️
genesis-check	1.43% <0.00%> (-0.01%)	⬇️
integration-tests	36.86% <0.90%> (-0.06%)	⬇️
linux	69.44% <0.90%> (-0.05%)	⬇️
linux-nightly	70.52% <0.90%> (-0.04%)	⬇️
macos	54.24% <0.00%> (-0.06%)	⬇️
pytests	1.65% <0.00%> (-0.01%)	⬇️
sanity-checks	1.44% <0.00%> (-0.01%)	⬇️
unittests	66.69% <0.00%> (-0.06%)	⬇️
upgradability	0.29% <0.00%> (-0.01%)	⬇️

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