[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

Beginne in cuda_core/cuda/core/experimental/_memory.py ungefähr bei Zeile 51, wo der schwache Fallback-Finalizer definiert ist, und verfolge, wie der close-Pfad des Buffer-Objekts ihn verwaltet. Die Arbeit ist abgeschlossen, wenn release() diesen Finalizer deregistriert, während close() weiterhin der explizite Weg bleibt, den Buffer freizugeben; prüfe die Details der nahegelegenen Buffer-Implementierung auf das relevante Verhalten.