test(rpc): add ERC-20 eth_call tests with proxy support (#278)

Co-authored-by: Haardik <haardik.haardik@coinbase.com>

Author: Himess

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "crates/test-utils/contracts/lib/solmate"]
 	path = crates/test-utils/contracts/lib/solmate
 	url = https://github.com/transmissions11/solmate
+[submodule "crates/test-utils/contracts/lib/openzeppelin-contracts"]
+	path = crates/test-utils/contracts/lib/openzeppelin-contracts
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts