DTensor support for bfloat16 stochastic rounding

[EduardDurech]

Resolves #2296

Upstream torch is not taking this seriously pytorch/pytorch#156649

[pytorch-bot]

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[EduardDurech]

@vkuzo done

test/test_low_bit_optim.py::TestQuantize::test_bf16_stochastic_round_dtensor_device_cpu_compile_False PASSED
test/test_low_bit_optim.py::TestQuantize::test_bf16_stochastic_round_dtensor_device_cpu_compile_True PASSED
test/test_low_bit_optim.py::TestQuantize::test_bf16_stochastic_round_dtensor_device_cuda_compile_False PASSED
test/test_low_bit_optim.py::TestQuantize::test_bf16_stochastic_round_dtensor_device_cuda_compile_True PASSED