Add cloudflare D1 support

[Xuanwo]

https://developers.cloudflare.com/api/operations/cloudflare-d1-query-database

We can implement D1 support via our KV adaptor

[ifmagic]

@Xuanwo I'd like to give it a try, please assign it to me.

[Xuanwo]

Have fun!

[ifmagic]

@Xuanwo This should be closed.

[Xuanwo]

@Xuanwo This should be closed.

We need to setup a behavior test for D1 first.

[ifmagic]

We need to setup a behavior test for D1 first.

Got it, I'll take care of it later.

[Xuanwo]

Got it, I'll take care of it later.

Thanks a lot first! It's more like a committers' job (since only committer can access secrets).

Let me help address this.