[FEA]: Enhance `load_nvidia_dynamic_lib` error message if a library cannot be found

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Area

cuda.pathfinder

Is your feature request related to a problem? Please describe.

load_nvidia_dynamic_lib does great job in looking for packages, runtime error could be confusing for an end user. It would be nice to have user friendly error if library was not found. For example that is how it is done at nvmath-python: https://github.com/NVIDIA/nvmath-python/blob/main/nvmath/_utils.py#L256-L262

Also some helper function (like runtime_nvidia_library_load_error(library_name:str) ) would be nice so user can add custom wrapper around load_nvidia_dynamic_lib.

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Additional context

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Inizia dal punto di ingresso cuda.pathfinder load_nvidia_dynamic_lib e confronta il suo comportamento attuale in caso di errore con le righe 256-262 di nvmath/_utils.py. Determina quali dettagli sulla libreria mancante sono disponibili nel punto dell’errore e se un helper riutilizzabile runtime_nvidia_library_load_error è adatto all’API esistente. Il lavoro è completato quando le librerie mancanti producono un errore chiaro per l’utente e il wrapper richiesto può usare l’helper.