contracts-bedrock: move DepositTx to core-utils (#2971)

This will allow the `DepositTx` class to be more easily
reusable across projects.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.changeset/three-wasps-burn.md

+---
+'@eth-optimism/contracts-bedrock': patch
+'@eth-optimism/core-utils': patch
+---
+
+Move the `DepositTx` type to `core-utils`. This way it can be more easily used across projects

packages/contracts-bedrock/helpers/index.ts

-export * from './utils'
-export * from './generateProofs'
-export * from './constants'

packages/contracts-bedrock/src/index.ts

-export * from './utils'
 export * from './generateProofs'
 export * from './constants'

packages/contracts-bedrock/tasks/deposits.ts

+/*
+ * Copyright (c) 2022, OP Labs PBC (MIT License)
+ * https://github.com/ethereum-optimism/optimism
+ */
+
 import { task, types } from 'hardhat/config'
 import { providers, utils, Wallet, Event } from 'ethers'
 import dotenv from 'dotenv'
 import 'hardhat-deploy'
-
-import { DepositTx } from '../src'
+import '@nomiclabs/hardhat-ethers'
+import { DepositTx } from '@eth-optimism/core-utils'
 
 dotenv.config()
 

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

@@ -7,3 +7,4 @@ export * from './batch-encoding'
 export * from './fees'
 export * from './rollup-types'
 export * from './op-node'
+export * from './deposit-transaction'