`CUstream` does not compare when the underlying pointer is the same

[leofang]

See CI failure: https://github.com/NVIDIA/cuda-python/actions/runs/13488648820/job/37683655417?pr=463#step:18:264

> assert other_stream.handle == stream.handle
E assert <CUstream 0x559c33ea2e20> == <CUstream 0x559c33ea2e20>
E + where <CUstream 0x559c33ea2e20> = <cuda.core.experimental._stream.Stream object at 0x7fd4dd21e1d0>.handle
E + and <CUstream 0x559c33ea2e20> = <cuda.core.experimental._stream.Stream object at 0x7fd4de7b7f40>.handle

tests/test_stream.py:93: AssertionError

[leofang]

@pciolkosz I left the meeting early today. What's the conclusion regarding stream's operator== behavior?