App Configuration Provider for Java (Non Spring Boot)

While we have a great library - `azure-spring-cloud-appconfiguration-config` for spring boot based java applications but we currently lack a java provider for applications that work on normal spring configuration.

While spring boot is the new technology that has been on the trend for quite some time, there would be quite a few projects which have been developed and running since several years using normal spring configuration. This is a new feature request to create a new app configuration provider for java to support non spring boot applications.