[Feature] Russian Keyboard Layout

[alex-popov-tech]

Context:

• Playwright Version: [1.12.2]
• Operating System: [Linux & Mac]
• Node.js version: [14.17.0]
• Browser: [Chromium]
• Extra: [any specific details about your environment]

## System:
 - OS: Linux 5.8 Ubuntu 20.04.2 LTS (Focal Fossa)
 - Memory: 15.31 GB / 31.30 GB
 - Container: Yes
## Binaries:
 - Node: 14.17.0 - /usr/bin/node
 - npm: 7.5.2 - /usr/local/bin/npm
## Languages:
 - Bash: 5.0.17 - /usr/bin/bash
## npmPackages:
 - playwright: 1.12.2 => 1.12.2 

## System:
 - OS: macOS 11.4
 - Memory: 670.91 MB / 32.00 GB
## Binaries:
 - Node: 15.3.0 - ~/.asdf/installs/nodejs/15.3.0/bin/node
 - Yarn: 1.22.10 - /usr/local/bin/yarn
 - npm: 7.0.14 - ~/.asdf/installs/nodejs/15.3.0/bin/npm
## Languages:
 - Bash: 3.2.57 - /bin/bash
## npmPackages:
 - playwright: 1.12.2 => 1.12.2 

Code Snippet

Help us help you! Put down a short code snippet that illustrates your bug and
that we can run and debug locally. For example:

const {chromium, webkit, firefox} = require('playwright');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
      await page.goto('https://learn.javascript.ru/article/keyboard-events/keyboard-dump/');
      const checkbox = await page.$('input[name="keyupStop"]');
      await checkbox.click();
      const input = await page.$('#kinput');
      await input.type(' working ', { delay: 500, noWaitAfter: false, timeout: 15000 });
      await input.type(' не работает ', { delay: 500, noWaitAfter: false, timeout: 15000 });
})();

Describe the bug

When I try to type russian characters keyup/down events are not triggered

[JoelEinbinder]

We currently hard code in a US keyboard layout. We can add in more layouts, but its a lot of work for each one so we've been waiting for a flood of user requests to prioritize it.

[pavelfeldman]

[GOOD FIRST ISSUE]

[santapan345]

I want to work on this issue.

[viraxslot]

@JoelEinbinder hi, could you please suggest how to nicely implement this feature?
Is it ok to:

• create the second file with the Russian layout
• create a common file and merge EN/RU layouts there
• use this common file in packages/playwright-core/src/server/input.ts instead of the English one?

I guess if somebody will want to add a new layout then more or less 2 lines should be changed. Of course besides the layout itself.