Function filter

filter<V>(it, f): AsyncGenerator<Awaited<V>, void, unknown>
Filters an iterable, only yielding items which match f.
```
filter([1, 2, 3, 4], e => e % 2 == 0);
returns [2, 4]
```
Type Parameters
- V
Parameters
- it: AsyncIterable<V>
- f: ((v: V) => boolean | Promise<boolean>)
  - - (v): boolean | Promise<boolean>
    - Parameters
      v: V
      Returns boolean | Promise<boolean>
Returns AsyncGenerator<Awaited<V>, void, unknown>