format: add --hash-prefix to add a hashed prefix for objects

[SandyXSD]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1657 (71f5da0) into main (ab6a02d) will decrease coverage by 0.01%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main    #1657      +/-   ##
==========================================
- Coverage   61.68%   61.66%   -0.02%     
==========================================
  Files         133      133              
  Lines       22595    22603       +8     
==========================================
+ Hits        13937    13938       +1     
- Misses       7097     7100       +3     
- Partials     1561     1565       +4     

Impacted Files	Coverage Δ
pkg/meta/config.go	54.66% <ø> (ø)
cmd/format.go	62.58% <71.42%> (+2.92%)	⬆️
cmd/mount.go	70.22% <100.00%> (+0.13%)	⬆️
pkg/chunk/cached_store.go	78.70% <100.00%> (+1.19%)	⬆️
pkg/chunk/utils_unix.go	73.33% <0.00%> (-20.00%)	⬇️
pkg/vfs/reader.go	81.56% <0.00%> (-3.11%)	⬇️

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