Allow handling of "JsonStructure" as input for "fromJson"

Hey there,

I just requested a new feature (see [jsonb-api/issues/111](https://github.com/eclipse-ee4j/jsonb-api/issues/111)) for the JSON-B API to allow [javax.json.JsonStructure](https://github.com/eclipse-ee4j/jsonp/blob/master/api/src/main/java/javax/json/JsonStructure.java) as input for deserialization

How about implementing this already in [JsonBinding.java](https://github.com/eclipse-ee4j/yasson/blob/master/src/main/java/org/eclipse/yasson/internal/JsonBinding.java) as a custom feature for Yasson?

```java
public class JsonBinding implements Jsonb {
...
T fromJson(JsonStructure jsonStruct, Class type) throws JsonbException;
T fromJson(JsonStructure jsonStruct, Type runtimeType) throws JsonbException;
}
```
Cheers,
Michael

Start with src/main/java/org/eclipse/yasson/internal/JsonBinding.java and inspect the existing fromJson entry points. Determine how JsonStructure inputs should be handled for both Class and Type runtimeType overloads; done means both proposed overloads support deserialization consistently with the existing Jsonb behavior.

Written by the indexing model from the issue text.