core-utils: delete unmaintained geth types

These geth types are legacy code and not being updated along
with the definitions of the geth types. They were used in
old regenesis events. They are not used elsewhere in the monorepo,
keeping them around only adds tech debt.

.changeset/beige-poems-switch.md

+---
+'@eth-optimism/core-utils': minor
+---
+
+Delete unmaintained geth types

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

-// Types explicitly related to dealing with Geth.
-
-/**
- * Represents the Ethereum state, in the format that Geth expects it.
- */
-export interface State {
-  [address: string]: {
-    nonce?: string
-    balance?: 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
-  eip150Hash?: string
-  eip155Block: number
-  eip158Block: number
-  byzantiumBlock: number
-  constantinopleBlock: number
-  petersburgBlock: number
-  istanbulBlock: number
-  muirGlacierBlock: number
-  berlinBlock: number
-  londonBlock?: number
-  arrowGlacierBlock?: number
-  grayGlacierBlock?: number
-  mergeNetsplitBlock?: number
-  terminalTotalDifficulty?: number
-  clique?: {
-    period: number
-    epoch: number
-  }
-  ethash?: {}
-}
-
-/**
- * Represents Geth's genesis file format.
- */
-export interface Genesis {
-  config: ChainConfig
-  nonce?: string
-  timestamp?: string
-  difficulty: string
-  mixHash?: string
-  coinbase?: string
-  number?: string
-  gasLimit: string
-  gasUsed?: string
-  parentHash?: string
-  extraData: string
-  baseFeePerGas?: string
-  alloc: State
-}
-
-/**
- * Represents the chain config for an Optimism chain
- */
-export interface OptimismChainConfig extends ChainConfig {
-  optimism: {
-    baseFeeRecipient: string
-    l1FeeRecipient: string
-  }
-}
-
-/**
- * Represents the Genesis file format for an Optimism chain
- */
-export interface OptimismGenesis extends Genesis {
-  config: OptimismChainConfig
-}

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

-/**
- * Utilities related to go-ethereum (Geth)
- */
-
-export * from './geth-types'

packages/core-utils/src/external/index.ts

@@ -4,4 +4,3 @@
 
 export * from './bcfg'
 export * from './ethers'
-export * from './geth'