refactor!: Bring the collections ext in line with other extension defs (

#1469)

Refactors the list operations definition so it's easier to add new ones
(#1467), and to bring it in line with the other extension definitions.

- Make the operation enum variants `camelCase`, to match their op names.
This lets us us `strum` to auto-derive all the string conversions.
- Implemented `MakeOpDef`, `MakeRegisteredOp`,

BREAKING CHANGE: Renamed `ListOp` variants to camelCase.
`collections::EXTENSION_NAME` is now called `EXTENSION_ID`.

hugr-core/src/hugr/rewrite/replace.rs

@@ -524,21 +524,21 @@ mod test {
                 inputs: vec![listy.clone()].into(),
                 sum_rows: vec![type_row![]],
                 other_outputs: vec![listy.clone()].into(),
-                extension_delta: collections::EXTENSION_NAME.into(),
+                extension_delta: collections::EXTENSION_ID.into(),
             },
         );
         let r_df1 = replacement.add_node_with_parent(
             r_bb,
             DFG {
                 signature: Signature::new(vec![listy.clone()], simple_unary_plus(intermed.clone()))
-                    .with_extension_delta(collections::EXTENSION_NAME),
+                    .with_extension_delta(collections::EXTENSION_ID),
             },
         );
         let r_df2 = replacement.add_node_with_parent(
             r_bb,
             DFG {
                 signature: Signature::new(intermed, simple_unary_plus(just_list.clone()))
-                    .with_extension_delta(collections::EXTENSION_NAME),
+                    .with_extension_delta(collections::EXTENSION_ID),
             },
         );
         [0, 1]

hugr-core/src/hugr/validate/test.rs

@@ -547,7 +547,7 @@ fn no_polymorphic_consts() -> Result<(), Box<dyn std::error::Error>> {
         PolyFuncType::new(
             [BOUND],
             Signature::new(vec![], vec![list_of_var.clone()])
-                .with_extension_delta(collections::EXTENSION_NAME),
+                .with_extension_delta(collections::EXTENSION_ID),
         ),
     )?;
     let empty_list = Value::extension(collections::ListValue::new_empty(Type::new_var_use(