Function ensureNonEmptyAsyncIterable

ensureNonEmptyAsyncIterable<T>(
value: AsyncIterable<T, any, any> | Iterable<T, any, any>,
): Promise<AsyncIterable<T, any, any>>
Ensures that a value is a non-empty async iterable.
```
- If the value is not async iterable, `undefined` is returned.
- If the async iterable yields no items, `undefined` is returned.
- If it yields at least one item, a fresh async iterable is returned which yields the first peeked item followed by
the rest, preserving behavior for one-shot async generators.
```
Supports both AsyncIterable and (optionally) synchronous Iterable.
Type Parameters
- T
Parameters
- value: AsyncIterable<T, any, any> | Iterable<T, any, any>
  The value to test as an async iterable.
Returns Promise<AsyncIterable<T, any, any>>
A non-empty async iterable, or undefined.