Add support for displaying remaining character count in rc-input

Currently, the rc-input package only provides support for displaying the character count of the provided input. It would be helpful to have the ability to switch to display the remaining character count also. This would be especially useful for situations where a user is limited to a specific number of characters, such as in form inputs or text areas.

I am requesting that support for displaying the remaining character count be added to the rc-input package. This would be a valuable addition to the package.

Thank you for considering this feature request.

Comienza localizando la implementación existente del conteo de caracteres y sus puntos de entrada públicos en el paquete rc-input; después, rastrea cómo se utiliza para inputs y textareas. La tarea estará terminada cuando los usuarios puedan cambiar de mostrar la cantidad introducida a mostrar la cantidad restante para un límite de caracteres configurado, conservando el comportamiento de conteo existente.