This is a POC for script based authenticator support.
Introduced a ScriptBasedAuthenticator that is bootstraped via a
ScriptBasedAuthenticatorFactory can be execute a configured script
against a provided execution context.
Added an alias property to the AuthFlowExecutionRepresentation in order
to be able to differentiate multiple instances of an Authenticator
within the same AuthFlow.
For convenience editing the AngularJS bindings for the ACE editor were
added for fancy script editing - this needs to be cut down a bit wrt to
themes and supported scripts - e.g. we probably don't expect users to write
authenticator scripts in Cobol...
Removed currently not needed ACE sytax highlighting and themes.
Scripting is now available to all keycloak components that have access to the KeycloakSession.
Introduced new Scripting SPI for configurable scripting providers.
