Write a function camelCaseKeys(obj) that takes an object and returns a new object where all keys are converted to camelCase.

The function should:

• Recursively convert keys of nested objects and arrays.
• Leave non-object values unchanged.
• Ensure the returned object has the same values as the original, but with transformed keys.

Example

camelCaseKeys({ "first_name": "John", "last-name": "Doe", "address_info": { "zip_code": 12345 } });
// { firstName: "John", lastName: "Doe", addressInfo: { zipCode: 12345 } }