Add support for sqlite backed durable objects.

[connyay]

Fixes #645

[connyay]

alt to https://github.com/cloudflare/workers-rs/pull/723 with some additional bindgen methods, a test, and a sandbox example.

~This PR uses jsvalue pretty liberally and omits SqlStorageValue. Happy to make a change if needed, but types are already wonky in sqlite and the rust/wasm layers make it even more confusing. Would love from someone from cloudflare to weigh in there. Ideally could skip things like https://github.com/cloudflare/workers-rs/pull/723/files#r2045394966 if we are just ysing jsvalues? 🤷‍♂️~

[connyay]

Ended up adding SqlStorageValue after attempting to use my fork. Definitely improves ergonomics.

[connyay]

sry. I was only iterating on npm run test 👼

[guybedford]

Thanks again for your work on this!