Description
We propose removing easyjson and refactoring the SDK to use the built-in encoding/json package. Although easyjson provides performance benefits, it has limitations when dealing with dynamic types, such as interface{} in search results. This was highlighted in #436, where large numeric values encountered precision issues. Switching to encoding/json would improve flexibility, maintainability, and error handling.

Basic example

// Replace easyjson.Marshal with json.Marshal
json.Marshal(data)