Recipe to migrate properties configuration to yaml configuration (and vice versa)

What problem are you trying to solve?

Migration of an existing application that uses properties for Spring configuration to use of YAML for Spring configuration.

What precondition(s) should be checked before applying this recipe?

Existence of application*.properties files.

Describe the situation before applying the recipe

src/main/resources/config/application.properties

server.port=${PORT:8080}
logging.level.org.atmosphere = warn
spring.mustache.check-template-location = false

Describe the situation after applying the recipe

src/main/resources/config/application.yml

server:
  port: ${PORT:8080}
logging:
  level:
    org.atmosphere: warn
spring:
  mustache:
    check-template-location: false

Have you considered any alternatives or workarounds?

Any additional context

Are you interested in contributing this recipe to OpenRewrite?

Start by locating the existing OpenRewrite Spring recipe entry points and tests for configuration-file migrations. Use the application*.properties precondition and the before/after examples in this issue to define the expected transformation in both directions. Done means the recipe handles the shown nested YAML structure and preserves the configuration values when converting between properties and YAML.