Major Description
Create a service provider interface for global configuration property sources. Currently, we support two built in sources: properties loaded from a classpath resource file named "log4j2.component.properties" and from system properties. This feature will abstract those two sources into an SPI with default implementations of those two sources as well as environment variables.
This SPI should be specified through the standard ServiceLoader API so as to make this simpler to support for users in any environment.
Related to LOG4J2-1431.