fix: Add empty dicts for unichain and base in config

Also fix example: we need a checked amount or slippage set now

--- don't change below this line ---
ENG-4332 Took 6 minutes

config/protocol_specific_addresses.json

@@ -7,5 +7,7 @@
       "native_token_address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
       "meta_registry_address": "0xF98B45FA17DE75FB1aD0e7aFD971b0ca00e379fC"
     }
-  }
+  },
+  "base": {},
+  "unichain": {}
 }

examples/encoding-example/main.rs

@@ -57,7 +57,7 @@ fn main() {
         given_amount: BigUint::from_str("1_000000000000000000").expect("Failed to create amount"),
         checked_token: usdc.clone(),
         exact_out: false, // it's an exact in solution
-        checked_amount: None, // the amount out will not be checked in execution
+        checked_amount: Some(BigUint::from(1u64)),
         swaps: vec![simple_swap],
         ..Default::default()
     };