meta/tkv: add an option to skip updating of nlink to reduce conflict

[SandyXSD]

This makes #3285 configurable.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (317267e) 55.37% compared to head (94b04e0) 55.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3322      +/-   ##
==========================================
+ Coverage   55.37%   55.41%   +0.03%     
==========================================
  Files         142      142              
  Lines       33967    33972       +5     
==========================================
+ Hits        18808    18824      +16     
+ Misses      13159    13148      -11     
  Partials     2000     2000              

Impacted Files	Coverage Δ
pkg/meta/config.go	50.69% <ø> (ø)
cmd/flags.go	93.88% <100.00%> (+0.10%)	⬆️
cmd/mount.go	55.92% <100.00%> (+0.09%)	⬆️
pkg/meta/tkv.go	71.23% <100.00%> (+0.11%)	⬆️

... and 3 files with indirect coverage changes

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