Feat: Pointer types

Specifically Pointers and Refs for Deno and wasm/linear memory

For Deno there will be a `DenoPtr` that holds the addr of `T` and `DenoRef` which reads `T` from it's address

For Wasm/linear memory this will be the same. but for `Ref` I'm not so sure how that is going to function.
Because a AB might be a copy/slice of the full memory which might invalidate a memory addr.
I'm just gonna assume that if it's not a nullptr that it should be a valid addr.