cmd/mount: add an option cache-eviction to specify the policy

[SandyXSD]

close #3473

[codecov-commenter]

Codecov Report

Patch coverage: 59.25% and project coverage change: -0.11 ⚠️

Comparison is base (7ed768b) 56.34% compared to head (f291465) 56.23%.

❗ Current head f291465 differs from pull request most recent head 3acc01c. Consider uploading reports for the commit 3acc01c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3478      +/-   ##
==========================================
- Coverage   56.34%   56.23%   -0.11%     
==========================================
  Files         149      149              
  Lines       36277    36296      +19     
==========================================
- Hits        20440    20412      -28     
- Misses      13609    13665      +56     
+ Partials     2228     2219       -9     

Impacted Files	Coverage Δ
pkg/chunk/cached_store.go	72.23% <ø> (ø)
pkg/chunk/mem_cache.go	56.17% <16.66%> (-2.86%)	⬇️
pkg/chunk/disk_cache.go	68.07% <62.50%> (-4.49%)	⬇️
cmd/flags.go	93.99% <100.00%> (+0.10%)	⬆️
cmd/mount.go	56.01% <100.00%> (+0.09%)	⬆️

... and 6 files with indirect coverage changes

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