Reactive collections should type arguments as immutable

### 🐞 Describe the Bug
The utilities for creating tracked collections that are exported from `@ember/reactive/collections` are documented to treat their arguments as immutable, but are typed to only accept mutable arguments. For example, the following produces a type error:

```ts
interface FooSignature {
Args: {
items: readonly string[];
setItems: (items: readonly string[]) => void;
}
}

export default
{{#let (trackedArray @items) as |arr|}}
{{!-- etc --}}
{{/let}}
satisfies TOC
```

because `@items` is a `readonly string[]` and `trackedArray` is typed to accept `T[]`, not `readonly T[]`. The various other utilities have similarly mutable-typed arguments.

### 🔬 Minimal Reproduction
See above

### 😕 Actual Behavior
Type error -- unable to pass immutable collections to the reactive utilities

### 🤔 Expected Behavior
No type error -- should be able to pass immutable collections to the reactive utilities

### 🌍 Environment

- Ember: -6.8
- Ember-CLI: N/A
- Node.js/npm: N/A
- OS: N/A
- Browser: N/a