Make find queries "lazier"

[jrolfs]

Following up on the comment below, we'd like to make LocatorPromise (augmented Promise<Locator>) act as much like a locator as possible, within reason...

#501 (comment)

I've changed some of my code to use .findByRole(...) recently and something I've noticed which is quite annoying is that it's quite jarring that it returns Promise<Locator>.

In practice, you sometimes end up writing code like this:

await screen.findByRole('button', { name: 'Apply' });
await screen.getByRole('button', { name: 'Apply' }).click();

// -- or --

const applyButton = await screen.findByRole('button', { name: 'Apply' });
await applyButton.click();

But wishing that you could continue to chain Locator methods onto the Promise<Locator>, like so:

await screen.findByRole('button', { name: 'Apply' }).click();

Could the concept of LocatorPromise providing a .within() method be extended to support calling other Locator methods directly upon the LocatorPromise or would this cause problems?