[keycloak-dev] Update on audit

Work completed: * Added AuditListener SPI (https://github.com/keycloak/keycloak/blob/master/audit/api/src/main/java/...) * Added JBoss Logging AuditListener implementation (this is used by default for all realms atm) * Added audit events for token service, social, account management and required actions Remaining work: * Add a AuditProvider SPI (extends AuditListener to add querying for events) * Add implementations of AuditProvider - atm I'm thinking a JPA and Mongo providers as a sensible starting point (with an option to remove events after N days). I've considered parsing logs, but I'm pretty sure that won't work for account management (and will also be quite limiting for admin console) * Allow configuring audit listeners/providers for a realm through admin console * View events associated with user in account management * View all events in admin console * Audit events for admin Related: * AuditListener/Provider could be useful for brute force protection * AuditListener could be used to allow applications to listen for user creation/update/deletion to sync user details into a separate database / maybe we could add a UserListener interface?