Sub-Records in config data

Today I've seen the following config property:

```
@ConfigProperty(defaultValue =
"SEQUENTIAL_THREAD CAPACITY(2) FLUSHABLE UNHANDLED_TASK_METRIC BUSY_FRACTION_METRIC")
TaskSchedulerConfiguration stateHasher
```

Here a `TaskSchedulerConfiguration` should be configured. `TaskSchedulerConfiguration` is a record that looks like this:

```
public record TaskSchedulerConfiguration(
@Nullable TaskSchedulerType type,
@Nullable Long unhandledTaskCapacity,
@Nullable Boolean unhandledTaskMetricEnabled,
@Nullable Boolean busyFractionMetricEnabled,
@Nullable Boolean flushingEnabled,
@Nullable Boolean squelchingEnabled) {}
```

It would be great if we can find a better way to define that configuration. Best would be if every property of the sub-record could be configured individually.