Challenge: Multi-Wallet Balance Checker

Build a function that checks the SOL balance of multiple wallets and returns formatted results.

Requirements

• Create an async function that accepts a Connection and an array of PublicKey objects
• For each wallet, fetch the balance using connection.getBalance()
• Convert lamports to SOL (divide by LAMPORTS_PER_SOL)
• Return an array of objects with publicKey (base58 string) and balanceInSol (number, rounded to 4 decimals)
• Use Promise.all() to fetch all balances in parallel