[FEAT]: to be able to use one or other DB

[Romerolweb]

Description

Hi,
I am learning Golang, and I am reading through your repo. It is really helpful to read the code for learning, however, I see something that would make it difficult to change later on. let´s pretend I want to start a project using Postgres, and then I see this file:

`package repositories

import (
"context"
"github.com/solrac97gr/go-jwt-auth/internal/user/domain/models"
)

func (repo *UserMongoDB) Save(user *models.User) error {
_, err := repo.collection.InsertOne(context.Background(), user)
if err != nil {
repo.logger.Error("Error saving user", err)
return err
}
return nil
}`

I am not sure how would I switch from mongoDB to Postgres easily.

thanks for your time.

Additional Information

No response