message: fix: update default RPC retry timeouts to match other languages
  Fixes:
diff: "initial_retry_delay_millis": 100,
  "retry_delay_multiplier": 1.3,
  "max_retry_delay_millis": 60000,
  - "initial_rpc_timeout_millis": 60000,
  - "rpc_timeout_multiplier": 1,
  + "initial_rpc_timeout_millis": 5000,
  + "rpc_timeout_multiplier": 1.3,
  "max_rpc_timeout_millis": 60000,
  "total_timeout_millis": 600000
  }
  