tsk-51: Refresh token endpoint (#54)

Closes #51

Reviewed-on: phoenix/icarus_auth#54
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

src/callers/mod.rs

@@ -8,4 +8,5 @@ pub mod endpoints {
     pub const DBTEST: &str = "/api/v2/test/db";
     pub const LOGIN: &str = "/api/v2/login";
     pub const SERVICE_LOGIN: &str = "/api/v2/service/login";
+    pub const REFRESH_TOKEN: &str = "/api/v2/token/refresh";
 }