fix(musa): expose device index helper for TorchDynamo

[wukecong-mt]

Summary

Map torch.cuda._get_device_index to
torch_musa.core._utils._get_musa_device_index in the CUDA module wrapper.

Motivation

TorchDynamo models torch.cuda.device(...) by calling
torch.cuda._get_device_index(...).

Without the mapping, TorchAda redirects the lookup to the top-level
torch_musa module, where the helper does not exist:

InternalTorchDynamoError:
AttributeError: module 'torch_musa' has no attribute '_get_device_index' 

Reproduction

import torch
import torchada

x = torch.ones(4, device="musa")

@torch.compile(backend="eager")
def f(t):
    with torch.cuda.device(t.device.index):
        return t + 1

print(f(x))

[yeahdongcn]

Please add a commit to bump version (replace all, should be 6 files).