Add user.copy/user.paste

[calebeby]

This example is from Puppeteer's docs to copy text:

await browser
  .defaultBrowserContext()
  .overridePermissions('<your origin>', ['clipboard-read', 'clipboard-write']);

// The clipboard API does not allow you to copy, unless the tab is focused.
await page.bringToFront();
await page.evaluate(() => {
  // Copy the selected content to the clipboard
  document.execCommand('copy');
  // Obtain the content of the clipboard as a string
  return navigator.clipboard.readText();
});

Since it is so complicated, maybe we should implement user.copy() that does all this automatically. Paste probably is also as complicated, so maybe user.paste() too.

[calebeby]

I had this in "up next", but even though it is easy to implement I don't think I'll implement it until someone comments on here saying this is a feature they need. It seems relatively uncommon.