Feature request: add instructions for YAML to generated application property file

[auke-]

As of Micronaut 4 the default application configuration format is no longer the YAML format but a property file format. Users might not be aware of the ability to use YAML as configuration format, so I propose the addition of instructions as comment in the generated application property file.

This comment should describe or contain a reference to instructions:

• how to enable build time YAML conversion using AOT and convertYamlToJava
• how to enable run time YAML support (by adding the snakeyaml dependency or selecting YAML using the starter)
• how to convert a property file to the YAML format or vice versa