feat(test): add tests for eth_getRequiredBlockState

Author: perama-v

tests/eth_getRequiredBlockState/get-required-block-state-17190873.io

@@ -0,0 +1,2 @@
+>> {"jsonrpc":"2.0","id":1,"method":"eth_getRequiredBlockState","params":["0x5f5e100"]}
+<< {"jsonrpc":"2.0","id":1,"result":null}