AppConfig support

[MatejNedic]

Type: Feature

Is your feature request related to a problem? Please describe. I would like to fetch configuration from AppConfig on application start up. This way I can keep my whole configuration away from my code and keep it in a same place as configuration for other applications.

Describe the solution you'd like For this I would like to use Spring.config.import. Example: spring.config.import: aws-appconfig:applicationId___configurationId___environment We can use another char for splitting ___ 3 * _ is just an example.

Describe alternatives you've considered Currently I would have to write my own implementation

Additional context https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/appconfigdata/AppConfigDataClient.html

[eddumelendez]

@MatejNedic there is already a branch for appconfig. hope it helps in the implementation. it is written with sdk v1 tho 😬