Add basic support for OAuth 2.0 Device Authorization Grant in oauth2-core, including:

  • Parameter names in OAuth2ParameterNames
  • Classes for device code and user code that extend AbstractOAuth2Token
  • HttpMessageConverter for Device Authorization Response
  • New AuthorizationGrantType constant for urn:ietf:params:oauth:grant-type:device_code

Issue spring-projects/spring-authorization-server#44