fix(client): proper encoding and data for account notifications

[pcbzzz]

Summary

@solana/client doesn't request base64 encoding for handleAccountNotifications even though it does for fetchAccount, so the account gets updated with data that is either base58 or an error about the account being too large for base58. The watcher also updates the account cache entry with .data which changes account.data from Base64EncodedRpcAccount to Base64EncodedDataResponse

I wasn't sure if this needed a changeset since it seems like a bug

Testing

• pnpm lint
• pnpm test
• pnpm build
• Other (describe): I have been using a patched version of the library and useAccount is no longer returning a base58 error for large accounts, and updated data is correct without workarounds

[vercel]

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