[TRACKING] breaking changes with API changes to consider with v2

This is a tracking issue with breaking changes such as `@Deprecated` annotated methods.

The resulting PR should be marked with breaking changes so that we can upgrade to the next major version (2.x)

List of tasks,

- [ ] public OpenFeatureClient : remove public access and make interna
- [ ] consider using `Number` for numeric evaluations
- [ ] rethink lombok and object creation
- [ ] Add a method to the `Hook` interface, through which the user can add hook data that can be accessed in a type safe manner during the flag evaluation:
```java
class MyHook implements Hook{
D getHookData(){
return myHookData;
}

void void after(HookContext ctx, FlagEvaluationDetails details, Map hints) {}
D data = ctx.getHookData(); // data == myHookData
}
}

```