use faster object store as cache tier

[davies]

close #1363

[codecov-commenter]

Codecov Report

Merging #1364 (45f86ed) into main (15ec194) will decrease coverage by 0.02%. The diff coverage is 10.00%.

@@            Coverage Diff             @@
##             main    #1364      +/-   ##
==========================================
- Coverage   59.52%   59.50%   -0.03%     
==========================================
  Files         128      129       +1     
  Lines       21643    21713      +70     
==========================================
+ Hits        12883    12920      +37     
- Misses       7232     7249      +17     
- Partials     1528     1544      +16     

Impacted Files	Coverage Δ
cmd/format.go	65.15% <0.00%> (-1.82%)	:arrow_down:
pkg/meta/config.go	100.00% <ø> (ø)
pkg/object/cache.go	0.00% <0.00%> (ø)
cmd/config.go	71.21% <44.44%> (-1.96%)	:arrow_down:
pkg/vfs/reader.go	76.45% <0.00%> (-3.11%)	:arrow_down:
cmd/bench.go	78.78% <0.00%> (-1.35%)	:arrow_down:
pkg/vfs/vfs_unix.go	97.79% <0.00%> (-1.08%)	:arrow_down:
pkg/meta/sql.go	67.76% <0.00%> (-0.21%)	:arrow_down:
pkg/meta/redis_lock.go	74.80% <0.00%> (-0.20%)	:arrow_down:
pkg/meta/tkv.go	76.10% <0.00%> (-0.09%)	:arrow_down:
... and 5 more

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