Implement `page|frameLocator|locator.frameLocator`

[ankur22]

Feature Description

This is a convenience method that makes working with iframes a little bit easier. At the moment we do:

const iframe = page.locator('iframe').contentFrame();

And with this new method we would do:

const iframe = page.frameLocator('iframe');

As well as working on page, we should implement the method for frameLocator and locator.

Suggested Solution (optional)

NA

Already existing or connected issues / PRs (optional)

NA

[matheusroedel]

I'm also depending on this implementation.