Port Layout Primitives

```[tasklist]
### Initial Port
- [x] Update namespace (to `CommunityToolkit.WinUI.Controls`)
- [x] Ignore `AdaptiveGridView` for now
- [x] Merge differences from UWP main to
- [x] WinAppSDK
- [x] Uno Platform fork
- [x] Import original doc or setup new doc
- [x] Samples
- [x] Tests
- [x] All brought over tests pass for UWP/WinAppSDK
- [x] Support for WASM via Uno Platform
```

```[tasklist]
### Known Issues / Remaining
- [x] WrapPanel Sample binding doesn't work form ItemsPanelTemplate
- [ ] UniformGrid not working properly in WASM
- [ ] ConstrainedBox sample missing as we don't have TilesBrush yet
- [ ] https://github.com/CommunityToolkit/Windows/issues/130
- [ ] https://github.com/CommunityToolkit/Windows/issues/129
- [ ] https://github.com/CommunityToolkit/Windows/issues/128
- [ ] Tests should be converted to use new test page setup over XamlReader
- [ ] Split StaggaredPanel/Layout doc and samples?
- [ ] https://github.com/CommunityToolkit/Windows/issues/131
```

## Notable Changes

- We didn't bring over `AdaptiveGridView` as it should be replaceable by the `UniformGridLayout` for `ItemsRepeater`

## Open Issues

## Future Improvements

Comienza con la checklist restante para los ejemplos y las pruebas de las primitivas de layout, especialmente con el problema de WASM de UniformGrid y el ejemplo de ConstrainedBox que falta. Revisa la configuración existente de la página de pruebas en lugar del enfoque de XamlReader. Se considera terminado cuando se hayan resuelto los elementos restantes enumerados, incluidos los issues vinculados y la división propuesta entre documentación y ejemplo.

Escrito por el modelo de indexación a partir del texto del issue.