Options for CEL in DRA

gistfile1.txt

We have an API type which roughly looks like:

```
type ResourcePool struct {
    // standard stuff
    Devices []Device
}

type Device struct {
    Name string
    Attributes []Atribute
}

type Attribute struct {
    Name string
    
    // one of the following must be set
    StringVal *string
    BoolVal *bool
    QuantityVal *Quantity
    VersionVal *string