feat(coprocessor): fhevm-listener, health check

Author: rudy-6-4

coprocessor/fhevm-engine/.cargo/deny.toml

@@ -96,6 +96,7 @@ allow = [
     "BSD-3-Clause-Clear",
     "BSL-1.0",
     "CC0-1.0",
+    "CDLA-Permissive-2.0",
     "ISC",
     "MIT",
     "MPL-2.0",