Hybrid execSync() and exec() Updates

[justintaylor-dev]

• Add error handling to execSync() to throw an error like execSync would in Node.js.

• Add standard asynchronous exec() function to Hybrid Plugin example, returning an error in the callback function.

https://forums.creativeclouddeveloper.com/t/system-call-access-for-uxp/799/30
https://forums.creativeclouddeveloper.com/t/task-scheduling-in-uxp-hybrid-plugins/6245