Support reading/writing add and remove action tags field

[b-phi]

Description

The written log files contain the tags field for add and remove operations, but the value is always null. Although some of the Python-Rust API allows providing a PyAddAction struct, it also doesn't include tags which is set to none when converting to an Add object. Ideally when writing data from Python I could provide a tags value and read this information back with DeltaTable.get_add_actions.

[b-phi]

It seems like all references to tags close to Python are related to the soon-to-be-deprecated arrow writer. To support in the rust writer, we'd need to propagate the info all the way down to create_add.

[thorfour]

I am also looking to be able to set custom tags and read them back. Would be nice to have this ability.