[FEA]: Add a `release()` method to `cuda.core.Buffer` to side-step the Python garbage collector

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Area

cuda.core

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

@realarnavgoel brought up this issue offline that we currently have a fallback weak finalizer
https://github.com/NVIDIA/cuda-python/blob/d425a8895bd778fffb993263dbf5d9bc631fea22/cuda_core/cuda/core/experimental/_memory.py#L51
in case users forget to explicitly call .close() to free the memory. This could interfere with projects such as nvmath-python and nvSHMEM who require explicit control over the buffer lifetime and deallocation timing.

Describe the solution you'd like

We discussed offline and came up with this proposal that we'll add a .release() method to the buffer object. The idea is that if it is called, the weak finalizer will be unregistered, so that the only way to free the buffer is to call .close() explicitly later.

Describe alternatives you've considered

No response

Additional context

No response

Inizia in cuda_core/cuda/core/experimental/_memory.py intorno alla riga 51, dove è definito il finalizzatore debole di fallback, e segui come il percorso di chiusura dell’oggetto Buffer lo gestisce. Il lavoro è completato quando release() deregistra quel finalizzatore, mentre close() rimane il modo esplicito per liberare il buffer; controlla i dettagli dell’implementazione di Buffer nelle vicinanze per il comportamento pertinente.