Can we use a simplier version of SetChildValue?

https://github.com/linksplatform/Collections/blob/ba3028128180745b384a93a34d77add82b82a16c/csharp/Platform.Collections/Trees/Node.cs#L82

```CS
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public Node SetChildValue(object value, params object[] keys)
{
for (var i = 0; i < keys.Length; i++)
{
SetChildValue(value, keys[i]);
}
return this;
}
```

Read csharp/Platform.Collections/Trees/Node.cs at the linked SetChildValue method and inspect its surrounding implementation. Determine whether a simpler equivalent preserves the current behavior for all keys; done means an agreed simplification is implemented and validated.

Written by the indexing model from the issue text.