Expose the deepname so it can be reused in custom instrumentation (#40)

Author: gscheibel

src/main/kotlin/com/expedia/graphql/schema/extensions/graphQLTypeExtensions.kt

@@ -10,7 +10,7 @@ import kotlin.reflect.KType
  * Renders a readable string from the given graphql type no matter how deeply nested
  * Eg: [[Int!]]!
  */
-internal val GraphQLType.deepName: String
+val GraphQLType.deepName: String
     get() = when {
         this is GraphQLNonNull -> "${this.wrappedType.deepName}!"
         this is GraphQLList -> "[${this.wrappedType.deepName}]"