🐛 [Bug]: Validator using Fiber v3 or v2 is not using json tags for field names.

[daibertdiego]

Bug Description

I'm using validator v10 with fiber v3 (but also tested on v2), and when I intercept validation errors, my custom messages are not using the json tag names, but the property names.
For example:

type ValidatorError struct {
	Errors map[string]interface{} `json:"errors"`
}

func NewValidatorError(err error) ValidatorError {
	e := ValidatorError{}
	e.Errors = make(map[string]interface{})
	errs := err.(validator.ValidationErrors)
	for _, v := range errs {
		e.Errors[v.Field()] = fmt.Sprintf("%v", v.Tag())
	}
	return e
}

type UserStatsCreateDTO struct {
	FirstName string `json:"first_name" validate:"required"`
	Age       int    `json:"age" validate:"required,gt=5"`
	BirthDate string `json:"birth_date" validate:"required,datetime=2006/01/02"`
}

			// Override default error handler
			ErrorHandler: func(ctx fiber.Ctx, err error) error {
				// Status code defaults to 500
				code := fiber.StatusInternalServerError

				// Set Content-Type: text/application-json; charset=utf-8
				ctx.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSON)

				// Retrieve the custom status code if it's a *fiber.Error
				var e *fiber.Error
				if errors.As(err, &e) {
					if errors.Is(err, fiber.ErrUnprocessableEntity) {
						code = fiber.ErrBadRequest.Code
					} else {
						code = e.Code
					}
				}

				if vldt, ok := err.(validator.ValidationErrors); ok {
					validationErrors := settings.NewValidatorError(vldt)
					// Return status code with error message
					return ctx.Status(fiber.ErrBadRequest.Code).JSON(validationErrors)
				}

				// Return status code with error message
				return ctx.Status(code).JSON(err.Error())
			},
		}),
	}

    func (h userStatsHandler) TestPost(c fiber.Ctx) error {
    	var userDTO UserStatsCreateDTO
    	// if err := c.BodyParser(&userDTO); err != nil {
    	if err := c.Bind().Body(&userDTO); err != nil {
    		return err
    	}
    
    	return c.JSON(userDTO)
    }

When I try to send an invalid request using this DTO, this is my response.

How to Reproduce

Steps to reproduce the behavior:

1. Go to '....'
2. Click on '....'
3. Do '....'
4. See '....'

Expected Behavior

Receive the error msg using the json tag name like :

{
errors:[
"first_name": required,
"age": gt,
"birth_date": datetime
]
}

Fiber Version

v3

Code Snippet (optional)

package main

import "github.com/gofiber/fiber/v3"
import "log"

func main() {
  app := fiber.New()

  // Steps to reproduce

  log.Fatal(app.Listen(":3000"))
}

Checklist:

• I agree to follow Fiber's Code of Conduct.
• I have checked for existing issues that describe my problem prior to opening this one.
• I understand that improperly formatted bug reports may be closed without explanation.

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