reactive/bindable **Iterable** data structure

This replace/shim JS Array, Map, and Set with `nusa/std` Vector, Map, Set.

```ts
import { Vector as Vec, Map, Set } from "//esm.run/nusa/std/collections"

export default {
coins = new Vec()
makets = new Map()
symbols = new Set()

shuffleLastCoin() {
console.debug("previous last coin", this.coins.at(-1))
this.coins.setAt(-1, dice([100, 300], [10, 50]))
}
}
```

Yes, indexing operator (i.e `arr[i]`) is not reactive and there is no way to override/overload it in JS. That's why the name is Vector, not Array.