cmd/evm: add state transition tool for testing (#20958)

This PR implements the EVM state transition tool, which is intended
to be the replacement for our retesteth client implementation.
Documentation is present in the cmd/evm/README.md file.

Co-authored-by: Felix Lange <fjl@twurst.com>

cmd/evm/testdata/7/alloc.json

@@ -0,0 +1,12 @@
+{
+  "a94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+    "balance": "0x5ffd4878be161d74",
+    "code": "0x",
+    "nonce": "0xac",
+    "storage": {}
+  },
+  "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192":{
+    "balance": "0xfeedbead",
+    "nonce" : "0x00"
+  }
+}

cmd/evm/testdata/7/env.json

@@ -0,0 +1,7 @@
+{
+  "currentCoinbase": "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+  "currentDifficulty": "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffff020000",
+  "currentGasLimit": "0x750a163df65e8a",
+  "currentNumber": "5",
+  "currentTimestamp": "1000"
+}

cmd/evm/testdata/7/readme.md

@@ -0,0 +1,7 @@
+This is a test for HomesteadToDao, checking if the 
+DAO-transition works
+
+Example: 
+```
+./statet8n --input.alloc=./testdata/7/alloc.json  --input.txs=./testdata/7/txs.json --input.env=./testdata/7/env.json --output.alloc=stdout --state.fork=HomesteadToDaoAt5
+```

cmd/evm/testdata/7/txs.json

@@ -0,0 +1 @@
+[]