Support TypedArray types...

TypedArrays are very helpful in certain situations...
for example a `Vec` or a Box<[i32]> could be turned into an `Int32Array` which is very helpful

## Rust
```rs
#[deno_bindgen]
pub fn mouse_pos(this: usize)-> Box<[i32]> {
let this=unsafe { ..... };
let pos=this.mouse_position();
vec![pos.x,pos.y].into_boxed_slice()
}

```
## denoland
```ts
export function mouse_pos(self: number|bigint): Int32Array {
return lib.symbols.mouse_pos(self);
}

```

Start by tracing how Rust return types such as Vec and Box<[i32]> are represented in the generated TypeScript bindings. Compare the Rust mouse_pos example with its Int32Array return type, then define the supported TypedArray mappings and verify that the generated denoland API exposes the expected type.

Written by the indexing model from the issue text.