Support `snapshot_properties` argument for `add_files` function

[enkidulan]

Feature Request / Improvement

It would be great to make the interface more aligned with append and overwrite function, which support snapshot_properties argument. The logic also seems simple enough to support the feature.

[Fokko]

@enkidulan Thanks for raising this, and I agree! Are you interested in contributing to this feature?

[enkidulan]

I've created a draft PR - #695