Describe the bug

At this time, the Zig SDK contains some hardcoded values when preparing the response object for Wasm Workers Server.

We should be able to return arbitrarily big responses from a Zig worker, and so, the Zig SDK should use allocation in order to prepare these responses, regardless of how big the response is.

Reproduction steps

1. Create a Zig worker following the documentation
2. Make it return a relatively big response
3. See crash due to memory limits

Expected behavior

An answer is produced normally, and returned by Wasm Workers Server back to the user.

Additional context

No response