Builder support for Map<String, String> as an option

[Tomas-Kraus]

It would be nice to have support for Config options like

  properties:
    eclipselink.target-database: MySQL
    eclipselink.target-server: None
    eclipselink.logging.level: FINEST
    eclipselink.logging.level.weaver: OFF
    eclipselink.logging.parameters: true
    eclipselink.weaving: false

to be provided using

    @Option.Configured
    Map<String, String> properties();

in the ConfigBlueprint.

Will require to modify TypeHandlerMap to process and return whole nodes subtree (including child nodes).

[tomas-langer]

There is a method asMap() on Config
This should be generated as config.get("key").detach().asMap().orElseGet(Map::of)