Support to emulate @media (hover: *)

[doochik]

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 1.19
• Platform / OS version: macOS
• URLs (if applicable):
• Node.js version: 10.16

What steps will reproduce the problem?

I want to emulate @media (hover: ...) to test my CSS at different devices.
Example:

a {
  color: green;
}

@media (hover: hover) {
  a:hover {
    background: red;
  }
}

@media (hover: hover) works well when I run this code in puppeteer+macOS. But I want to emulate @media (hover: none) for mobile device to test it.

What is the expected result?

API to configure input mechanism.

[JoelEinbinder]

Seems reasonable. I didn't know about @media (hover)

[lehni]

Possibly related: #5096

[ReDrUm]

+1 for this please