Add verifier information (#3839)

* add verifier information

* cleanup

Co-authored-by: bjoern <r10s@b44t.com>

* finish name change

* simple improvements & new ffi

* fixs

Co-authored-by: bjoern <r10s@b44t.com>
Co-authored-by: septias <xxsebastian.kleahnxx@gmail.com>

src/e2ee.rs

@@ -297,6 +297,7 @@ Sent with my Delta Chat Messenger: https://delta.chat";
             verified_key: Some(pub_key.clone()),
             verified_key_fingerprint: Some(pub_key.fingerprint()),
             fingerprint_changed: false,
+            verifier: None,
         };
         vec![(Some(peerstate), addr)]
     }