add core copyfile func

[trajan0x]

Description

Copies a file

[codecov]

Codecov Report

Patch coverage: 52.00000% and project coverage change: +0.22715% 🎉

Comparison is base (747a5d9) 60.19232% compared to head (16c6130) 60.41947%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #1291         +/-   ##
===================================================
+ Coverage   60.19232%   60.41947%   +0.22714%     
===================================================
  Files            534         566         +32     
  Lines          32966       34234       +1268     
  Branches         277         277                 
===================================================
+ Hits           19843       20684        +841     
- Misses         11343       11668        +325     
- Partials        1780        1882        +102     

Flag	Coverage Δ
agents	66.78183% <ø> (+0.59489%)	⬆️
cctp-relayer	65.31303% <ø> (?)
core	64.64298% <52.00000%> (-0.00560%)	⬇️
ethergo	63.80952% <ø> (-0.09368%)	⬇️
explorer	53.40488% <ø> (ø)
omnirpc	69.82429% <ø> (ø)
promexporter	41.02564% <ø> (?)
release-copier-action	19.33333% <ø> (ø)
scribe	57.23494% <ø> (-0.13336%)	⬇️
tools	21.72452% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
core/os.go	63.07692% <52.00000%> (-6.92308%)	⬇️

... and 48 files with indirect coverage changes

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