Add ndarray f16/bf16 support

[swfsql]

Pull Request Template

Checklist

• Confirmed that cargo run-checks command has been executed.
• Made sure the book is up to date with changes in this PR.

Related Issues/PRs

• Fixes Add ndarray f16/bf16 support #4077

Changes

• Makes necessary changes to support ndarray's f16 and bf16 types.

Testing

• I ran a very minor testing in a downstream user crate (just using the feature, with a matmul on autodiff) -- but no testing currently included in this PR.
• If properly supported (if support is added to ndarray), proper tests are more viable.

In this draft state, where a patch is needed, the downstream user crates also need the patch on Cargo.toml:

[patch.crates-io]
ndarray = { git = 'https://github.com/swfsql/ndarray.git', rev = 'bc68d2f3f99680ccd7aba1069efa686bcf94dedf' }

[github-actions]

This PR has been marked as stale because it has not been updated for over a month