fuse: automatically add ro option if mount with --read-only

[SandyXSD]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1661 (cef6bf4) into main (1e49f93) will increase coverage by 0.22%.
The diff coverage is 45.45%.

@@            Coverage Diff             @@
##             main    #1661      +/-   ##
==========================================
+ Coverage   61.53%   61.76%   +0.22%     
==========================================
  Files         133      133              
  Lines       22595    22607      +12     
==========================================
+ Hits        13904    13963      +59     
+ Misses       7126     7083      -43     
+ Partials     1565     1561       -4     

Impacted Files	Coverage Δ
cmd/main.go	50.29% <0.00%> (+1.42%)	⬆️
pkg/fuse/fuse.go	77.59% <0.00%> (-0.51%)	⬇️
pkg/utils/utils.go	79.24% <60.00%> (-2.01%)	⬇️
cmd/gateway.go	87.20% <100.00%> (-0.11%)	⬇️
cmd/mount.go	70.58% <100.00%> (+0.49%)	⬆️
pkg/meta/sql.go	67.28% <0.00%> (-0.21%)	⬇️
pkg/meta/tkv_tikv.go	62.23% <0.00%> (+0.19%)	⬆️
cmd/format.go	62.58% <0.00%> (+0.20%)	⬆️
pkg/vfs/backup.go	65.97% <0.00%> (+0.35%)	⬆️
... and 6 more

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