Start working on separating pairs from 2 tuples in Aiken

co-authored-by: KtorZ <matthias.benkort@gmail.com>

crates/aiken-project/src/blueprint/definitions.rs

@@ -145,6 +145,13 @@ impl Reference {
                     elems = Self::from_types(elems, type_parameters)
                 ),
             },
+            Type::Pair { fst, snd } => Self {
+                inner: format!(
+                    "Pair{fst}{snd}",
+                    fst = Self::from_type(fst, type_parameters),
+                    snd = Self::from_type(snd, type_parameters)
+                ),
+            },
 
             // NOTE:
             //

crates/aiken-project/src/blueprint/schema.rs

@@ -384,6 +384,7 @@ impl Annotated<Schema> {
                 }
             },
             Type::Fn { .. } => unreachable!(),
+            Type::Pair { .. } => unreachable!(),
         }
     }
 }