Add (file)-attribute parameter to MakeDir task

### Feature description
While working on a small company internal SDK, i needed to create a temporary directory in the project root, e.g. called `.sdk`. To follow good practice the directory is prefixed with an dot and should have the Hidden-file-attribute like the `.vs` directory created by Visual Studio or our lovely `.git` one.

Project file
```xml

```

### Expected behavior
MSBuild should create an hidden directory `.sdk`.

### Further thoughts
The `Attributes` parameter would be an `ITaskItem[]` containing 0-n file attributes.
Those would be parsed by the MakeDir-task, e.g. using the `Enum.Parse` .net method.

How would the task act if there is a deeper directory structure to create? E.g. `.sdk\some-sub-dir`. Should both directories be hidden, etc. or should the attribute parameter only apply to the parent dir?

Regarding the fact that the hidden-attribute probably is the only attribute the is used in practice, you could change it to an boolean MSBuild attribute called `Hidden`.

### Environment data
MSBuild Version 15.7.179.6572