## 🚀 Feature Proposal

Add support for the WebAuthn Automation API, a standard WebDriver extension that allows developers to create virtual authenticators to test websites using WebAuthn.

https://w3c.github.io/webauthn/#sctn-automation

_note: the above link may not work until https://github.com/w3c/webauthn/pull/1340 is merged_

## Motivation

At the moment there is no practical way to write e2e tests for pages using WebAuthn. Since this is a standard WebDriver API, the cost of implementing a layer on java is low.

## Example

For a page like this

```html
<button id="signup">Sign up with webauthn</button>
<span id="result"></span>
```

```javascript
document.getElmentById("signup").addEventListener("click", () => {
  navigator.credentials.create({...}).then(credentials => {
    document.getElementById("result").innerText = "Success!";
  })
});
```

A test could be written like so:

```java
// HasVirtualAuthenticator is an interface that augments a RemoteWebDriver.
HasVirtualAuthenticator virtualAuthenticatorManager = ((HasVirtualAuthenticator) driver);
VirtualAuthenticatorOptions options = new VirtualAuthenticatorOptions();
VirtualAuthenticator authenticator =
    virtualAuthenticatorManager.addVirtualAuthenticator(options);
driver.findElement(By.id("signup")).click();
WebElement result = driver.findElement(By.id("result"));
new WebDriverWait(driver, 60, 1000).until(
    driver -> !result.getText().equals(""));
assertThat(result.getText()).isEqualTo("Success!");
```

## Implementation

We can implement the AddVirtualAuthenticator and RemoveVirtualAuthenticator methods first since they're the most useful and follow up with the others in subsequent PRs.
String GO_FORWARD = "goForward";
  String REFRESH = "refresh";
  String ADD_COOKIE = "addCookie";
  static CommandPayload ADD_COOKIE(Cookie cookie) {
    return new CommandPayload(ADD_COOKIE, ImmutableMap.of("cookie", cookie));
  }
  String GET_ALL_COOKIES = "getCookies";
  String GET_COOKIE = "getCookie";
  String DELETE_COOKIE = "deleteCookie";
  static CommandPayload DELETE_COOKIE(String name) {
    return new CommandPayload(DELETE_COOKIE, ImmutableMap.of("name", name));
  }
  String DELETE_ALL_COOKIES = "deleteAllCookies";
  String FIND_ELEMENT = "findElement";
  static CommandPayload FIND_ELEMENT(String strategy, String value) {
    return new CommandPayload(FIND_ELEMENT, ImmutableMap.of("using", strategy, "value", value));
  }
  String FIND_ELEMENTS = "findElements";
  static CommandPayload FIND_ELEMENTS(String strategy, String value) {
    return new CommandPayload(FIND_ELEMENTS, ImmutableMap.of("using", strategy, "value", value));
  }
  String FIND_CHILD_ELEMENT = "findChildElement";
  static CommandPayload FIND_CHILD_ELEMENT(String id, String strategy, String value) {
    return new CommandPayload(FIND_CHILD_ELEMENT,
                              ImmutableMap.of("id", id, "using", strategy, "value", value));
  }
  String FIND_CHILD_ELEMENTS = "findChildElements";
  static CommandPayload FIND_CHILD_ELEMENTS(String id, String strategy, String value) {
    return new CommandPayload(FIND_CHILD_ELEMENTS,
                              ImmutableMap.of("id", id, "using", strategy, "value", value));