Handle Engine States in Babylon Native

Currently, NativeEngine.js does not support changing and relying on states through the available state properties:

```
/**
* Gets the depth culling state manager
*/
public get depthCullingState(): DepthCullingState {
return this._depthCullingState;
}

/**
* Gets the alpha state manager
*/
public get alphaState(): AlphaState {
return this._alphaState;
}

/**
* Gets the stencil state manager
*/
public get stencilState(): StencilState {
return this._stencilState;
}

/**
* Gets the stencil state composer
*/
public get stencilStateComposer(): StencilStateComposer {
return this._stencilStateComposer;
}
```

Those are only working in WebGL and WebGPU. In Native state changes needs to flow through the old APIs dedicated functions like:
`setState`, `setDepthBuffer` and similar...

It is the source of both potential bugs (even in our current version) and forces ThinEngine to be bigger than required.