feat: support multi multipart.FileHeader binding

[almas1992]

close #227
close goravel/goravel#229

type UserForm struct {
	Name string                  `validate:"required"`
	File []*multipart.FileHeader `validate:"required"`
}

data, err := validate.FromRequest(ctx.Request().Origin())
if err != nil {
	panic(err)
}

v := data.Create()
v.AddRule("name", "required")
v.AddRule("file", "required")

if v.Validate() { // validate ok
	// safeData := v.SafeData()
	userForm := &UserForm{}
	if err := v.BindSafeData(userForm); err != nil {
		panic(err)
	}

	// do something ...
	for k, v := range userForm.File {
             fmt.Println(k, "=====", v.Filename)
        }
} else {
	fmt.Println(v.Errors)       // all error messages
	fmt.Println(v.Errors.One()) // returns a random error message text
}

curl --location 'http://127.0.0.1:3000/files' \
--form 'name="test"' \
--form 'file=@"./docker-entrypoint.sh"' \
--form 'file=@"./start.sh"'

Print:

0 ===== docker-entrypoint.sh
1  ===== start.sh

[coveralls]

Pull Request Test Coverage Report for Build 14162087994

Details

• 19 of 21 (90.48%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.06%) to 96.681%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
data_source.go	19	21	90.48%

Totals
Change from base Build 14049851125:	-0.06%
Covered Lines:	2942
Relevant Lines:	3043

---

💛 - Coveralls