Move package config to an interface

[dmlloyd]

• Change PackageConfig to an interface
• Move JAR-specific configuration to JarConfig group
• Replace package type with combination of JAR type and JAR/native enable flags
• Introduce compatibility interceptors for complex remappings
• Update all build steps, tests, and POMs to use the new properties

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[dmlloyd]

This must stay in draft until SmallRye Config is released with smallrye/smallrye-config#1128.

[edeandrea]

FYI I don't think the templates on code.quarkus.io were updated to accomodate some of these changes. When I create a project from code.quarkus.io it still generates <quarkus.package.type>native</quarkus.package.type> in the native profile...