[Feature] Locator to implement Iterable

[bnesteruk]

A Locator object apparently can be resolved to several elements, so can represent a list.
And there are some useful methods to use in this case (e.g. Locator.first() Locator.nth() etc).
Same time, If I need to iterate several locators, the only way I see (please correct me if I'm wrong) is to get the count first, and then take each new item by index from locator list manually:

let itemsCount = await this.pickLkistItem.count() // find the count
for (let index = 0; index < itemsCount; index++) { 
    let item = this.pickLkistItem.nth(index) //get the element by index within locator list
    // . . . do what you need
}

And this looks really overwhelming.
If a locator can be a list, could we use the Iterable functions instead? E.g.:

for (const item of [this.pickLkistItem]) {
      item // . . . do what you need
}

Or:

this.pickLkistItem.forEach(it => { arr.push(await it.textContent()) });
this.pickLkistItem.reduce((result, item) => { . . . }

I guess that the count of the locator items should be frozen at the point of the iterable function start, so if it increases, additional iterations are ignored. Otherwise, a 'missing element' error should be thrown if the count decreased

Or I'm missing something and this is already supported somehow?

[mxschmitt]

Looks like a duplicate of #12336.