[FEA]: Support inheritance from Buffer

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Area

cuda.core

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

nvmath-python is considering creating a subclass of Buffer specific to NVSHMEM because we want to mostly follow cuda.core's semantics for Buffer/MemoryResource, but need some different behavior regarding garbage collection.

Describe the solution you'd like

Buffer should use classmethod instead of staticmethod for all methods that return an instance of the class. i.e. from_handle() and _reduce_helper()

Describe alternatives you've considered

Composing Buffer with our Buffer.
Replicating the Buffer protocol with an unrelated class.
Rolling our own MemoryResource/Buffer abstraction that is unique to nvmath's distributed APIs.

Additional context

Related to: https://github.com/NVIDIA/cuda-python/issues/750

Inizia individuando l'implementazione di Buffer di cuda.core e i relativi metodi from_handle() e _reduce_helper(), quindi esamina come vengono costruite le istanze restituite. Esamina l'issue #750 correlata e il comportamento rilevante di Buffer; il lavoro è completato quando le sottoclassi ereditano entrambi i metodi e ricevono istanze della sottoclasse senza compromettere il comportamento esistente di Buffer.