Type Map<String,String> in config root is not working

[starksm64]

If I have a Map<String,String> in a config object such as:

@ConfigRoot(name = "rt", phase = ConfigPhase.RUN_TIME)
public class TestRunTimeConfig {
    /** A map of properties */
    @ConfigItem
    public Map<String, String> stringMap;
...

With an application.properties configuration like:

# A root map of properties
quarkus.rt.string-map.key1=value1
quarkus.rt.string-map.key2=value2
quarkus.rt.string-map.key3=value3

The are no values populated into the stringMap.

[starksm64]

What currently happens is that processing goes into this ConfigDefintion#processMap(...) code block:

        } else {
            // treat as a plain object, hope for the best
            // TODO, REVISIT THIS
            final ObjectConfigType leaf = new ObjectConfigType(NO_CONTAINING_NAME, mct, true, "", valueClass);
            //container.getConfigDefinition().getLeafPatterns().addPattern(subKey, leaf);
        }

and no leaf node ends up handling the configuration value.

[starksm64]

I think I have a straightforward fix for this

[starksm64]

It got a little more complicated when I got to the bytecode generation to load the config into runtime. Let me know if there are changes.

[dmlloyd]

I incorporated some of these changes and the tests into #1430. If that one looks/works OK, merging it will auto-close this PR.