Enhance to Capture Required If scenarios

Current Usage

```
def(%{"A"}) -> Passes

def(%{"B"}) -> Passes

def(neither) -> [a: required, b: required] 
```

This usage isn't explicit as it doesn't provide ability to specify to the consumer that either a or b is required

Target state
`def(neither) -> [a: [required_if(& input.b == nil)], b: [required_if(& input.a == nil)]]`




