feat(sdk): add Bedrock Alpha Testnet contracts

Adds contract addresses for the Bedrock Alpha testnet.

.changeset/chilly-cups-agree.md

+---
+'@eth-optimism/sdk': patch
+---
+
+Adds contract addresses for the Bedrock Alpha testnet

packages/sdk/src/interfaces/types.ts

@@ -30,6 +30,7 @@ export enum L2ChainID {
   OPTIMISM_HARDHAT_LOCAL = 31337,
   OPTIMISM_HARDHAT_DEVNET = 17,
   OPTIMISM_BEDROCK_LOCAL_DEVNET = 901,
+  OPTIMISM_BEDROCK_ALPHA_TESTNET = 28528,
 }
 
 /**

packages/sdk/src/utils/chain-constants.ts

@@ -23,6 +23,7 @@ export const DEPOSIT_CONFIRMATION_BLOCKS: {
   [L2ChainID.OPTIMISM_HARDHAT_LOCAL]: 2 as const,
   [L2ChainID.OPTIMISM_HARDHAT_DEVNET]: 2 as const,
   [L2ChainID.OPTIMISM_BEDROCK_LOCAL_DEVNET]: 2 as const,
+  [L2ChainID.OPTIMISM_BEDROCK_ALPHA_TESTNET]: 12 as const,
 }
 
 export const CHAIN_BLOCK_TIMES: {
@@ -146,6 +147,22 @@ export const CONTRACT_ADDRESSES: {
     },
     l2: DEFAULT_L2_CONTRACT_ADDRESSES,
   },
+  [L2ChainID.OPTIMISM_BEDROCK_ALPHA_TESTNET]: {
+    l1: {
+      AddressManager: '0xb4e08DcE1F323608229265c9d4125E22a4B9dbAF' as const,
+      L1CrossDomainMessenger:
+        '0x838a6DC4E37CA45D4Ef05bb776bf05eEf50798De' as const,
+      L1StandardBridge: '0xFf94B6C486350aD92561Ba09bad3a59df764Da92' as const,
+      StateCommitmentChain:
+        '0x0000000000000000000000000000000000000000' as const,
+      CanonicalTransactionChain:
+        '0x0000000000000000000000000000000000000000' as const,
+      BondManager: '0x0000000000000000000000000000000000000000' as const,
+      OptimismPortal: '0xA581Ca3353DB73115C4625FFC7aDF5dB379434A8' as const,
+      L2OutputOracle: '0x3A234299a14De50027eA65dCdf1c0DaC729e04A6' as const,
+    },
+    l2: DEFAULT_L2_CONTRACT_ADDRESSES,
+  },
 }
 
 /**