consider moving the deserialization code from the main thread to the workers

[Zeno Wu]

in here, https://github.com/tursodatabase/libsql-js/blob/1df5a35989c93ba9000a7facdf6dd726d73c702f/src/statement.rs, we're blocking the JS main thread for deserializing the native values, ideally we could make it happen on worker threads to free some cycles from the JS thread to do something else.