Expose opset19 and new dtypes

[justinchuby]

No description provided.

[codecov]

Codecov Report

Merging #819 (b2ab484) into main (db1b50d) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head b2ab484 differs from pull request most recent head 5242718. Consider uploading reports for the commit 5242718 to get more accurate results

@@            Coverage Diff             @@
##             main     #819      +/-   ##
==========================================
- Coverage   76.23%   76.10%   -0.13%     
==========================================
  Files         113      113              
  Lines       13312    13315       +3     
  Branches     1321     1321              
==========================================
- Hits        10148    10133      -15     
- Misses       2838     2856      +18     
  Partials      326      326              

Impacted Files	Coverage Δ
onnxscript/__init__.py	83.33% <ø> (ø)

... and 6 files with indirect coverage changes