[ruby-core:107097] [Ruby master Bug#18484] Fiber should return it self when blocked by IO

Issue #18484 has been reported by jakit (Jakit Liang).

----------------------------------------
Bug #18484: Fiber should return it self when blocked by IO
https://bugs.ruby-lang.org/issues/18484

* Author: jakit (Jakit Liang)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [arm64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Here's an example:

```
f = Fiber.new do
  sleep(1)
  Fiber.yield 123
end

p f.resume
```

Output:

```
nil
```

Expected output:

```
#<Fiber:0x000000010e825b18@(irb):59 (paused)>
```

========================

In JavaScipt, an example like:

```
async function testAsync() {
    return "hello async";
}

const result = testAsync();
console.log(result);
```

Output:

```
Promise { 'hello async' }
```




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