radicle: Add `resolves` and `labels` method to `cob::patch::Revision`

To be able to query the `BTreeSet` that shows which comments are
resolved by a specific revision and the `Iterator` of `Label` we require
some methods to obtain them.

radicle/src/cob/patch.rs

@@ -1462,6 +1462,11 @@ impl Revision {
         &self.discussion
     }
 
+    /// Review comments resolved by this revision.
+    pub fn resolves(&self) -> &BTreeSet<(EntryId, CommentId)> {
+        &self.resolves
+    }
+
     /// Iterate over all top-level replies.
     pub fn replies(&self) -> impl Iterator<Item = (&CommentId, &thread::Comment<CodeLocation>)> {
         self.discussion.comments()
@@ -1654,6 +1659,11 @@ impl Review {
         self.comments.comments()
     }
 
+    /// Review labels.
+    pub fn labels(&self) -> impl Iterator<Item = &Label> {
+        self.labels.iter()
+    }
+
     /// Review general comment.
     pub fn summary(&self) -> Option<&str> {
         self.summary.as_deref()