Stream component default state

When creating a stream component there is not a well-defined default state. This goes for every method of adding a component.

```cpp
 // is stream_toggle true or false for these?
ctx.add(Aim{});
ctx.generate(Aim{});
registry.add_component(entity, Aim{});
```

We need to make it clear what the default is and potentially making the default configurable at either the language level or with some API.