Support getter-only list.

Apologies whenever this issue is not appropriate.

May I have a chance of deserializing a collection field using a getter only?

```java

public List getSome() { // JAXB used to work with this.
if (some == null) {
some = new ArrayList<>();
}
return some;
}

//public void setSome(List some) {
// this.some = some;
//}

private List some;
```

Thank you.

The issue names no source files or tests. Start by locating JSON-B collection deserialization and how getter-only properties are discovered, then check the relevant specification or implementation entry point. Done means a getter-only List can be populated during deserialization, with a regression test covering the example behavior.

Written by the indexing model from the issue text.