core-utils: update geth genesis type

Can specify the private key in the json file which
is nice for testing

.changeset/shy-panthers-hear.md

+---
+'@eth-optimism/core-utils': patch
+---
+
+Update geth genesis type

packages/core-utils/src/external/geth/geth-types.ts

@@ -7,36 +7,52 @@ export interface State {
   [address: string]: {
     nonce: number
     balance: string
-    codeHash: string
-    root: string
+    codeHash?: string
+    root?: string
     code?: string
     storage?: {
       [key: string]: string
     }
+    secretKey?: string
   }
 }
 
+/**
+ * Represents Geth's ChainConfig
+ */
+export interface ChainConfig {
+  chainId: number
+  homesteadBlock: number
+  eip150Block: number
+  eip155Block: number
+  eip158Block: number
+  byzantiumBlock: number
+  constantinopleBlock: number
+  petersburgBlock: number
+  istanbulBlock: number
+  muirGlacierBlock: number
+  berlinBlock: number
+  londonBlock?: number
+  arrowGlacierBlock?: number
+  mergeForkBlock?: number
+  terminalTotalDifficulty?: number
+  clique?: {
+    period: number
+    epoch: number
+  }
+  ethash?: {}
+}
+
 /**
  * Represents Geth's genesis file format.
  */
 export interface Genesis {
-  config: {
-    chainId: number
-    homesteadBlock: number
-    eip150Block: number
-    eip155Block: number
-    eip158Block: number
-    byzantiumBlock: number
-    constantinopleBlock: number
-    petersburgBlock: number
-    istanbulBlock: number
-    muirGlacierBlock: number
-    clique: {
-      period: number
-      epoch: number
-    }
-  }
+  config: ChainConfig
+  nonce?: number
+  timestamp?: number
   difficulty: string
+  mixHash?: string
+  coinbase?: string
   gasLimit: string
   extraData: string
   alloc: State