feature request: expose inserted row ids

[akhilpai]

Hello, thank you for the wonderful work!

When a table's primary key is generated by sqlite, it would be useful to return a reference to that id. For example, my use case is a web app where I would like to redirect a user after a form entry.

Exposing last_pk/last_rowid would be enough for single records I think, but it may be good to consider how to handle multiples.