No support for `block_scale_quantize` in the python graph API

[cbcase]

Describe the bug
The python frontend graph API is missing the block_scale_quantize API. Interestingly, it does have block_scale_dequantize:

>>> graph.block_scale_quantize
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'cudnn._compiled_module.pygraph' object has no attribute 'block_scale_quantize'. Did you mean: 'block_scale_dequantize'?

Expected behavior
The python API here should match the cpp API.

System Environment (please complete the following information):

• cudnn_frontend version: 1.14.1
• cudnn_backend version: 9.8.0
• GPU arch: B200
• cuda runtime version: 12.8
• cuda driver version: 575.57.08
• host compiler: unsure
• OS: ubuntu22.04

Additional context
This looks like a simple fix to add the relevant wrapper function to python/pygraph/pygraph.cpp, but it's possible I'm missing something.

[cbcase]

Looks like this a dupe of #129