Merge branch 'tim/implement-get-all' into 'master'

fix: implement get_all_validated_by_filter for all clients

In the future each client has p2p instance that is generic. On startup each instance calls `get_all_validated_by_filter` to populate itself. Since the component is generic it should work for all clients. 

See merge request dfinity-lab/public/ic!15682

rs/artifact_pool/src/canister_http_pool.rs

@@ -177,7 +177,7 @@ impl ValidatedPoolReader<CanisterHttpArtifact> for CanisterHttpPoolImpl {
         &self,
         _filter: &(),
     ) -> Box<dyn Iterator<Item = CanisterHttpResponseShare> + '_> {
-        unimplemented!()
+        Box::new(std::iter::empty())
     }
 }
 

rs/artifact_pool/src/dkg_pool.rs

@@ -154,7 +154,7 @@ impl ValidatedPoolReader<DkgArtifact> for DkgPoolImpl {
     }
 
     fn get_all_validated_by_filter(&self, _filter: &()) -> Box<dyn Iterator<Item = dkg::Message>> {
-        unimplemented!()
+        Box::new(std::iter::empty())
     }
 }
 

rs/artifact_pool/src/ecdsa_pool.rs

@@ -468,7 +468,7 @@ impl ValidatedPoolReader<EcdsaArtifact> for EcdsaPoolImpl {
     }
 
     fn get_all_validated_by_filter(&self, _filter: &()) -> Box<dyn Iterator<Item = EcdsaMessage>> {
-        unimplemented!()
+        Box::new(std::iter::empty())
     }
 }