radicle: TypedId improvements

- Add `Serialize` implementation
- Add `is_identity` method

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

radicle/src/cob.rs

@@ -21,7 +21,7 @@ pub use radicle_cob::{
 pub use radicle_cob::{create, get, git, list, remove, update};
 
 /// The exact identifier for a particular COB.
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Serialize)]
 pub struct TypedId {
     /// The identifier of the COB in the store.
     pub id: ObjectId,
@@ -51,6 +51,12 @@ impl TypedId {
         self.type_name == *patch::TYPENAME
     }
 
+    /// Returns `true` is the [`TypedId::type_name`] is for an
+    /// [`identity::Identity`].
+    pub fn is_identity(&self) -> bool {
+        self.type_name == *identity::TYPENAME
+    }
+
     /// Parse a [`crate::git::Namespaced`] refname into a [`TypedId`].
     ///
     /// All namespaces are stripped before parsing the suffix for the