Test createAddress

Benchmarks gas usage

Note the estimator needs to be updated as this is now variable-gas to the
state.

processor/ethereum/router/src/tests/mod.rs

@@ -41,6 +41,9 @@ use crate::{
 };
 
 mod constants;
+
+mod create_address;
+
 mod erc20;
 use erc20::Erc20;