Add web stub for this package

# Feature request

It would be nice to add a web stub implementation for this package based on react-native-web
## Possible implementation

I haven't dived in much how the actual implementation can be, however, a stub based on normal `` could be suffice I suppose.

### Code sample

```jsx
export function MaskedViewWeb({ maskElement: _ /* Not used */, ...props }: MaskedViewProps) {
return ;
}
```