feat: add additional oauth attributes including prompt, login-hint, etc

[jpoehnelt]

<drive-picker
  app-id="YOUR_APP_ID"
  client-id="YOUR_CLIENT_ID"
  prompt=""
  login-hint="me@jpoehnelt.dev"
  scope="https://www.googleapis.com/auth/drive.file profile email"
  hd=""
>
  <drive-picker-docs-view></drive-picker-docs-view>
</drive-picker>

The picker:oauth:response event object looks like this with the above attributes:

{
  "access_token": "ya29.OMITTED",
  "authuser": "1",
  "expires_in": 3599,
  "prompt": "consent",
  "scope": "email profile https://www.googleapis.com/auth/userinfo.email openid https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/drive.file",
  "token_type": "Bearer"
}

also split category for oauth in storyboook table

cc #37