chore: add additional native BN converter (cherry-pick of #2446)

[peri044]

Description

This change adds an additional native BN converter which improves performance of models using BN

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[gs-olive]

Looks good to me - please merge #2441 as well when merging this PR, then tag both.

[gs-olive]

Also #2454 should be merged with this

[github-actions]

Code conforms to Python style guidelines

[github-actions]

Code conforms to C++ style guidelines