[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

Comienza en cuda_core/cuda/core/experimental/_memory.py alrededor de la línea 51, donde se define el finalizador débil de respaldo, y sigue cómo la ruta de cierre del objeto Buffer lo gestiona. El trabajo estará terminado cuando release() cancele el registro de ese finalizador, mientras close() siga siendo la forma explícita de liberar el buffer; revisa los detalles de la implementación cercana de Buffer para conocer el comportamiento relevante.