[compiler] Add support for @catch on fieldDefinitions, interfaces and objects

[martinbonnin]

Implementation of apollographql/specs#48
See apollographql/specs#47

@catch can now be set, by order or precedence:

At the schema level

// All fields are modeled as FieldResult in Kotlin
extend schema @catch(to: RESULT)

At the field definition level

type User {
  // email is modeled as FieldResult in Kotlin
  email @catch(to: RESULT)
}

// or if you don't own the schema
extend type User @catchField(name: "email", to: RESULT)

At the field level

query GetEmail {
  user {
    // email is modeled as FieldResult in Kotlin for this query only
    email @catch(to: RESULT)
  }
}

Also took this opportunity to factor in the @semanticNonNullField handling in schema merging so that it's done in a central place.

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[martinbonnin]

Not sure why we need this now. I'm attributing this to latest EAP but something to keep an eye on

[BoD]

👍

[martinbonnin]

Ping @rohandhruva . If everything goes well, this should end up in the SNAPSHOTs soon.

[rohandhruva]

Thank you so much, I'll keep an eye out for it!