[Feature] support .raw({columnNames: true}) for D1PreparedStatement

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Description

So there currently are bindings for calling `.raw()` on a prepared statement.

https://github.com/cloudflare/workers-rs/blob/bb141710ebcf38b5a61c6e8f1d1c20c3dd2f3f6d/worker-sys/src/types/d1.rs#L98-L99

However, the option to fetch column names too via `.raw({columnNames: true})` is not supported right now.

https://developers.cloudflare.com/d1/worker-api/prepared-statements/#raw

It would be great for writing interfaces to existing ORMs like diesel.

I'm currently forking & updating an old diesel-d1 codebase I found (fork: https://github.com/hydrogen602/diesel-d1) and diesel indexes into a row via an `usize` so returning arrays of arrays are perfect for that.

Start by reading worker-sys/src/types/d1.rs around lines 98-99 and the linked D1 raw() documentation. Confirm how options are represented in the existing bindings, then expose the columnNames option for D1PreparedStatement::raw while preserving existing raw() behavior; done means callers can request column names.

Written by the indexing model from the issue text.