Use `Worker` to prevent ui lock on heavy calculations (node converting & code generation)

[softmarshmallow]

When to use workers?

• When running detections
• When converting whole file to ReflectNode
• When generating code

References

• https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
• https://medium.com/techtrument/multithreading-javascript-46156179cf9a
• https://www.jameslmilner.com/post/workers-with-webpack-and-typescript/