implement `impl` as classes

[littledivy]

Doable with Box<T>. Reference/Mutable reference for methods and deallocate box when consumed/finalization

pub struct NonSerializable {
  inner: i32,
}

#[deno_bindgen]
impl NonSerializable {
  pub fn add(&mut self, a: i32) {
    self.inner += a;
  }
  
  #[deno_bindgen(constructor)]
  pub fn new() -> Self {
    Self { inner: 0 }
  }
}

const ptr = new NonSerializable();
ptr.add(10)