Support `viem@^2.23.12` in `@alchemy/aa-accounts` for Berachain compatibility

[nguyennhukhanh]

[REQUIRED] Environment

• AA SDK version: ^3.19.0
• Package: @alchemy/aa-accounts

[REQUIRED] Describe the problem
The current version of @alchemy/aa-accounts does not support Berachain from viem@^2.23.12, causing a TypeScript error when attempting to use it in an aa-wallet module.

** How to reproduce:**

1. Install the latest @alchemy/aa-accounts and viem@^2.23.12.
2. Import Berachain from viem/chains:

   import { berachain } from 'viem/chains';

3. Attempt to create a light account using createLightAccount with Berachain:

   const account = await createLightAccount({
       transport: transport,
       chain: berachain,
       signer,
   });

4. This results in a TypeScript error related to the chain property.

** Relevant code or sample repro:**

import { createLightAccount } from '@alchemy/aa-accounts';
import { createAlchemySmartAccountClient } from '@alchemy/aa-alchemy';
import { LocalAccountSigner } from '@alchemy/aa-core';
import { berachain } from 'viem/chains';

const account = await createLightAccount({
    transport: transport,
    chain: berachain,
    signer,
});

** Expected Behavior**
The package should support Berachain from viem@^2.23.12 without type conflicts.

** Actual Behavior**
The following TypeScript error occurs:

Type '{ blockExplorers: { readonly default: { readonly name: "Berascan"; readonly url: "https://berascan.com"; }; }; contracts: { readonly multicall3: { readonly address: "0xcA11bde05977b3631167028862bE2a173976CA11"; readonly blockCreated: 0; }; readonly ensRegistry: { ...; }; readonly ensUniversalResolver: { ...; }; }; ....' is not assignable to type 'Chain'.

** Suggested Fix**
Please update @alchemy/aa-accounts to support viem@^2.23.12 and ensure compatibility with Berachain.

[nguyennhukhanh]

And please support the document: https://accountkit.alchemy.com/packages/aa-accounts

[lippytm]

Please solve these issues and implement the solutions.

[lippytm]

Issues that need attention