Update CODEOWNERS for updates to genesis and network config snapshots (…

…MystenLabs#3863)

* add CODEOWNERS to snapshot_tests.rs

* Add comment for what to do when breaking genesis snapshot

* Fix owners for crypto files

.github/CODEOWNERS

@@ -1,3 +1,7 @@
-sui_core/src/crypto.rs @huitseeker
-sui/src/keystore.rs @huitseeker @patrickkuo
+/crates/sui-types/src/crypto.rs @huitseeker
+/crates/sui-sdk/src/crypto.rs @huitseeker @patrickkuo
+
 *.md @Clay-Mysten @randall-Mysten
+
+# When snapshot changes, most likely we will need to recreate the genesis blob.
+/crates/sui-config/tests/snapshot_tests.rs @tharbert @huitseeker

crates/sui-config/tests/snapshot_tests.rs

@@ -47,6 +47,10 @@ fn genesis_config_snapshot_matches() {
     assert_yaml_snapshot!(genesis_config);
 }
 
+// If a Move change breaks the test below, it is because related Move functions are included
+// in the genesis blob. The test failure can be fixed by updating the snapshot / blob.
+// Also, folks in the file's CODEWOWNERS should be notified about the change. They may need to
+// re-create the genesis blob.
 #[test]
 fn empty_genesis_snapshot_matches() {
     let genesis = Builder::new().build();