Implement Object::Delete for Node-API-JSI

[Filed by Copilot on behalf of @bghgary]

**Describe the bug**

Node-API-JSI’s `Napi::Object::Delete` overloads throw `std::runtime_error("TODO")` instead of deleting the requested property. [The implementation is currently stubbed](https://github.com/BabylonJS/JsRuntimeHost/blob/main/Core/Node-API-JSI/Include/napi/napi-inl.h).

**To Reproduce**

```cpp
auto object = Napi::Object::New(env);
object.Set("value", 1);
object.Delete("value");
```

The final call throws `"TODO"`.

**Expected behavior**

`Object::Delete` should delete the property and return the result without throwing.

**Screenshots**

N/A

**Other**

- Platform: Windows x64 with the JSI backend.

Start in Core/Node-API-JSI/Include/napi/napi-inl.h and locate the Napi::Object::Delete overloads that currently throw std::runtime_error("TODO"). Reproduce the issue with the provided object.Set("value", 1) and object.Delete("value") example. Done means the property is deleted, the result is returned, and the call no longer throws.

Written by the indexing model from the issue text.