support sync limits

[zhijian-pro]

Close #1624

[codecov-commenter]

Codecov Report

Merging #1651 (7ed32f0) into main (6cb675a) will increase coverage by 0.09%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##             main    #1651      +/-   ##
==========================================
+ Coverage   61.37%   61.47%   +0.09%     
==========================================
  Files         133      133              
  Lines       22565    22594      +29     
==========================================
+ Hits        13850    13890      +40     
+ Misses       7152     7137      -15     
- Partials     1563     1567       +4     

Impacted Files	Coverage Δ
pkg/sync/config.go	92.30% <33.33%> (-7.70%)	⬇️
pkg/sync/sync.go	44.44% <70.00%> (+4.70%)	⬆️
cmd/sync.go	67.48% <100.00%> (+0.68%)	⬆️
pkg/object/webdav.go	72.80% <0.00%> (-0.78%)	⬇️
pkg/chunk/cached_store.go	75.46% <0.00%> (-0.52%)	⬇️
pkg/meta/sql.go	67.08% <0.00%> (-0.11%)	⬇️
cmd/mount.go	70.08% <0.00%> (ø)
pkg/meta/tkv_tikv.go	62.04% <0.00%> (ø)
pkg/vfs/writer.go	79.66% <0.00%> (+1.01%)	⬆️

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