Support scanning a specific branch of a table

### Feature Request / Improvement

As far as I can tell, PyIceberg does not directly support being able to scan a particular branch of an iceberg table. For example, there is no way to be able to run an equivalent of queries like

SELECT * FROM `..;`

as documented in https://iceberg.apache.org/docs/1.8.0/branching/#schema-selection-with-branches-and-tags

I can see that PR #941 to add support to _write_ to branches in Pyiceberg is well on its way to be being merged in, so this would be a useful complement.

Alternatively, perhaps I'm mistaken and there is already a way to do this, but it wasn't clear in the documentation

Comienza leyendo la documentación sobre branching y selección de esquemas de Iceberg enlazada en el issue, y después revisa el PR #941 para conocer la compatibilidad existente con la escritura en branches. Inspecciona la API de scan actual de PyIceberg y determina cómo debería seleccionarse una tabla con un branch especificado; se considera terminado cuando los llamadores pueden escanear un branch específico de una tabla como en el ejemplo de consulta documentado.

Escrito por el modelo de indexación a partir del texto del issue.