feat(chain): expose SectionChain via API

src/routing/approved.rs

@@ -91,6 +91,10 @@ impl Approved {
         Ok(Self::new(node, section, Some(section_key_share), event_tx))
     }
 
+    pub fn section_chain(&self) -> SectionChain {
+        self.section.chain().clone()
+    }
+
     // Creates the approved state for a regular node.
     pub fn new(
         node: Node,

src/routing/mod.rs

@@ -205,6 +205,11 @@ impl Routing {
         self.stage.comm.our_connection_info()
     }
 
+    /// Returns the Section Proof Chain
+    pub async fn section_chain(&self) -> SectionChain {
+        self.stage.state.lock().await.section_chain()
+    }
+
     /// Prefix of our section
     pub async fn our_prefix(&self) -> Prefix {
         *self.stage.state.lock().await.section().prefix()