Property/Env Configuration Adapter

[csviri]

Currently, if I want to pass configuration properties (ControllerConfiguration, Operator configuration) via properties or environmental variables, or etc, I have to implement that from scratch. While we could provide a generic naming scheme and support that automatically.

Implementation should be portable, so as with metrics, we should not be opinionated, there are multiple config lib alternatives like:

• MicroProfile Config
• Lightbend config
• Apache Commons Configuration
• Smallrye Config

Support for those could be provided as submodules as with metrics.
Out of the box, we can provide an implementation (no external dependency) that reads environment variables and system properties. Mainly a naming scheme.