Security Fix: Remap UNSANDBOXED mode to V8 Isolate to prevent RCE

[wonderofme]

Description

This Pull Request patches a Critical Remote Code Execution (RCE) vulnerability in the execution engine.

The Vulnerability:
The default configuration (UNSANDBOXED mode) previously used noOpCodeSandbox, which relies on the Function constructor. This allowed user-supplied code to access the host process process.env and execute arbitrary commands.

The Fix:
I have updated the loadCodeSandbox function to map UNSANDBOXED and SANDBOXED modes to loadV8IsolateSandbox. This ensures that even in default configurations, user code is executed within a secure V8 Isolate, preventing unauthorized access to the host server.

Type of Change

• Security Patch
• Bug fix