Update CustomGemmFloat, improve quantization to float 8

[xadupre]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (02e81fb) 79.61% compared to head (fe6fb3b) 79.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #66   +/-   ##
=======================================
  Coverage   79.61%   79.62%           
=======================================
  Files          25       25           
  Lines        2041     2042    +1     
=======================================
+ Hits         1625     1626    +1     
  Misses        416      416           

Files Changed	Coverage Δ
...nnx_extended/tools/graph/onnx_graph_transformer.py	74.44% <ø> (ø)
onnx_extended/reference/c_reference_backend.py	76.77% <100.00%> (+0.15%)	⬆️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.