4.x: Config driven and pico @Named fixes

[tomas-langer]

The config driven should work as follows

configuration yaml:

server:
  port: 8080
ft:
  asyncs:
   first: 
    executor: "exec"
   second:
    executor: "service"
  bulkheads:
    - queue: 10

configuration beans:

@ConfigBean("ft.asyncs") // read it from ft.asyncs node, repeatable
AsyncConfig {..}

@ConfigBean("ft.bulheads") // read it from ft.bulkheads node, repeatable
BulkheadConfig {..}

@ConfigBean(value = "server", repeatable = false) // read it from server, not repeatable
ServerConfig {...}

When processing, the code to create the beans should be similar to this pseudo:

Config config; // located at the node of the config bean, such as `ft.asyncs`
if (configBeanAnnotation.repeatable()) {
  if (config.isList()) {
    - each node in the list is a config bean instance, named by the index (config.key().name()), we may want to introduce some custom config key to explicitly define a name, such as __name
  } else {
    - each child node is a config bean instance, named by the config node name (e.g. "first" and "second" for async)
    config.asNodeList().ifPresent(it -> it.forEach(configBeanCfg -> {
      String name = configBeanCfg.key().name(); // to be used with @Named
      String fullyQualifiedKey = configBeanCfg.key().toString(); // can also create a Named instance
  }
} else {
  // this is a non-repeatable config bean, just create a single instance from this place, not named (e.g. cannot be injected using @Named, as conceptually we cannot give it a name, we may support @default name + no name if we want to
}

To get instaces in Pico:

@Inject //config driven by ServerConfig
Server server;

@Inject //config driven by AsyncConfig
@Named("first")
Async firstAsync;

@Inject 
@Named("0") // index based naming - not much usable, but maybe somebody is just interested in the whole list and does not want to inject by name
Bulkhead bulkhead;

[trentjeff]

After #6680 is merged, there will be this todo item:

    @Disabled("Will be addressed in #6674")
    @Test
    void namedConfiguredServices() {
        ConfigBeanRegistry cbr = (ConfigBeanRegistry) ConfigBeanRegistryHolder.configBeanRegistry().orElseThrow();
        Map<String, Collection<GeneratedConfigBean>> all = cbr.allConfigBeans();

//        System.out.println(all);
    }

In NamedConfiguredByTest.