## 🚀 Feature Proposal

#7753 added basic support for WebAuthn automation in the form of the `addVirtualAuthenticator` and `removeVirtualAuthenticator` methods. Implement the rest of the methods: `addCredential`, `getCredential`, `removeCredential`, `removeAllCredentials`, `setUserVerified`.

## Motivation

Support more WebAuthn use-cases, like logging in with a specific credential, handling user verification failures, and inspecting generated credentials.

## Example

For a page like this

```html
<button id="login">Log in with WebAuthn</button>
<span id="result"></span>
```

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

A test could be written like so:

```java
// Set up the virtual authenticator.
HasVirtualAuthenticator virtualAuthenticatorManager = ((HasVirtualAuthenticator) driver);
VirtualAuthenticatorOptions options = new VirtualAuthenticatorOptions();
VirtualAuthenticator authenticator =
    virtualAuthenticatorManager.addVirtualAuthenticator(options);

// New code: inject a credential into the authenticator.
// Without this API the developer would have to generate a credential through
// navigator.credentials.create({...}) on the javascript side and would have less
// control over the resulting PK.
Credential credential = Credential.createNonResidentCredential(...params);
virtualAuthenticatorManager.addCredential(authenticator, credential);

// Assert login successful:
driver.findElement(By.id("login")).click();
WebElement result = driver.findElement(By.id("result"));
new WebDriverWait(driver, 60, 1000).until(
    driver -> !result.getText().equals(""));
assertThat(result.getText()).isEqualTo("Success!");
```
protected void log(SessionId sessionId, String commandName, Object toLog, When when) {
    if (!logger.isLoggable(level)) {
      return;
    }
    String text = String.valueOf(toLog);
    if (commandName.equals(DriverCommand.EXECUTE_SCRIPT)
        || commandName.equals(DriverCommand.EXECUTE_ASYNC_SCRIPT)) {
      if (text.length() > 100 && Boolean.getBoolean("webdriver.remote.shorten_log_messages")) {
        text = text.substring(0, 100) + "...";
      }
    }
    switch(when) {
      case BEFORE:
        logger.log(level, "Executing: " + commandName + " " + text);
        break;
      case AFTER:
        logger.log(level, "Executed: " + text);
        break;
      case EXCEPTION:
        logger.log(level, "Exception: " + text);
        break;
      default:
        logger.log(level, text);
        break;
    }
  }
  public FileDetector getFileDetector() {
    return fileDetector;
  }
  protected class RemoteWebDriverOptions implements Options {