refactor(context): (reupload) Added an optional permission parameter to the SaveUploadedFile method (#4068)

[haesuo566]

The SaveUploadedFile method previously set folder permissions to 0o750 by default when creating directories. A third parameter, ...fs.FileMode, has been added to allow customizable permissions. This update enables users to optionally set folder permissions when creating directories and files with the SaveUploadedFile method.

// example
func SaveFile(ctx *gin.Context) error {
	file, err := ctx.FormFile("file")
	if err != nil {
		return err
	}

	var perm fs.FileMode = 0o755
	return ctx.SaveUploadedFile(file, "/asset/file", perm)
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.93%. Comparing base (3dc1cd6) to head (62a6522).
Report is 83 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4088      +/-   ##
==========================================
- Coverage   99.21%   98.93%   -0.28%     
==========================================
  Files          42       44       +2     
  Lines        3182     3393     +211     
==========================================
+ Hits         3157     3357     +200     
- Misses         17       25       +8     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	98.93% <100.00%> (?)
-tags go_json	98.93% <100.00%> (?)
-tags nomsgpack	98.92% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	98.93% <100.00%> (-0.28%)	⬇️
go-1.22	98.93% <100.00%> (?)
macos-latest	98.93% <100.00%> (-0.28%)	⬇️
ubuntu-latest	98.93% <100.00%> (-0.28%)	⬇️

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