[Feature] Support deleting multiple R2 objects

[lukevalenta]

Is there an existing issue for this?

• I have searched the existing issues

Description

Currently, the Rust bindings only support deleting a single key at a time (

workers-rs/worker-sys/src/types/r2/bucket.rs

Line 24 in 3f0db65

pub fn delete(this: &R2Bucket, key: String) -> Result<js_sys::Promise, JsValue>;

), but the Javascript API supports deleting up to 1000 keys at once: https://developers.cloudflare.com/r2/api/workers/workers-api-reference/#bucket-method-definitions.

We should add a delete_multiple call to support this.