Add MUSA custom ops support

[yeahdongcn]

Testing Done

All 244 tests pass on both test containers (torch_musa 2.7.0 and 2.7.1).

root@xiaodongye-s80:/ws# TORCHADA_ENABLE_CPP_OPS=1 TORCHADA_CPP_OPS_VERBOSE=1 python -c "import torchada"
Using /root/.cache/torch_extensions/py310_mu40304 as PyTorch extensions root...
Detected MUSA files, patching ldflags
Emitting ninja build file /root/.cache/torch_extensions/py310_mu40304/torchada_cpp_ops/build.ninja...
Building extension module torchada_cpp_ops...
Using envvar MAX_JOBS (12) as the number of workers...
ninja: no work to do.
Loading extension module torchada_cpp_ops...
root@xiaodongye-s80:/ws# TORCHADA_ENABLE_CPP_OPS=1 TORCHADA_DEBUG_CPP_OPS=1 python -c "
import torch
import torchada

x = torch.tensor([1.0, -2.0, 3.0], device='cuda')
y = torch.neg(x)
print('Result:', y.cpu())
"
[torchada] neg called
Result: tensor([-1.,  2., -3.])

[yeahdongcn]

@wenqf11 PTAL.