Currently, config-by-file is bound to registries via the YamlConfigurationSourceBuilder, which requires each module having a registry to build such source, using sensible default for e.g. root path or file name regex pattern.

As a first step, we have to follow java-free module conventions, i.e. /<module>/<definitionType>/<relativePath>/<name>.yaml, when we bind sources to registries with defaults.

As a separate step (MAGNOLIA-6076), we will make it optional to have file-observation set up.