split file and fs provider

[ktong]

No description provided.

[codecov]

Codecov Report

Merging #49 (ff1615f) into main (f0cdfba) will increase coverage by 0.14%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   77.06%   77.21%   +0.14%     
==========================================
  Files          15       17       +2     
  Lines         593      610      +17     
==========================================
+ Hits          457      471      +14     
- Misses        127      129       +2     
- Partials        9       10       +1     

Components	Coverage Δ
konf	97.36% <100.00%> (-0.69%)	⬇️
file	71.11% <100.00%> (-4.59%)	⬇️
pflag	41.57% <ø> (ø)

Files	Coverage Δ
config.go	95.31% <100.00%> (-2.33%)	⬇️
option.go	100.00% <ø> (ø)
provider/file/file.go	100.00% <100.00%> (ø)
provider/file/option.go	100.00% <100.00%> (ø)
provider/file/watch.go	54.38% <100.00%> (ø)
provider/fs/fs.go	100.00% <100.00%> (ø)
provider/fs/option.go	100.00% <100.00%> (ø)
provider/pflag/option.go	100.00% <ø> (ø)