Support for client side decryption in Config Server

[rtbhosale]

Spring config server can be configured to have decryption of encrypted property values either at server side or client side.

https://cloud.spring.io/spring-cloud-config/reference/html/#_encryption_and_decryption https://cloud.spring.io/spring-cloud-config/reference/html/#_serving_encrypted_properties

Steeltoe ConfigServer doesn't seems to support the client side decryption.

It would be nice to have this feature as it makes it easier to plug to an existing system which already has client side decryption enabled.

Thank you.