[gluon] Add fused_sigmoid_mul_add

[apinge]

fix reduce bug and add fused_sigmoid_mul_add

Current performance on cdna4 with trition 3.6.0

 python -m pytest test_fused_sigmoid_mul_add.py -v -k benchmark -s
========================================================================================== test session starts ===========================================================================================
platform linux -- Python 3.12.3, pytest-9.0.2, pluggy-1.6.0 -- /opt/venv/bin/python
cachedir: .pytest_cache
hypothesis profile 'default'
rootdir: /root/workspace/pyhip
configfile: pytest.ini
plugins: hypothesis-6.150.2
collected 6 items / 3 deselected / 3 selected                                                                                                                                                            

test_fused_sigmoid_mul_add.py::test_benchmark[1x4096_bf16] 
[benchmark] 1x4096 torch.bfloat16
  fused: 15.74 us/iter, 1.56 GB/s
  ref:   11.70 us/iter, 2.10 GB/s  speedup 0.74x
PASSED
test_fused_sigmoid_mul_add.py::test_benchmark[2x4096_bf16] 
[benchmark] 2x4096 torch.bfloat16
  fused: 17.09 us/iter, 2.88 GB/s
  ref:   12.06 us/iter, 4.08 GB/s  speedup 0.71x
PASSED
test_fused_sigmoid_mul_add.py::test_benchmark[8000x4096_bf16] 
[benchmark] 8000x4096 torch.bfloat16
  fused: 53.86 us/iter, 3650.42 GB/s
  ref:   76.33 us/iter, 2575.99 GB/s  speedup 1.42x
PASSED

==================================================================================== 3 passed, 3 deselected in 1.40s =====================================================================================