fix(compileTypesAsync): improve worker termination logic

[steven-pribilinskiy]

Improve worker termination logic to enhance the handling of active worker instances.

Graceful termination yields to unnecessary CPU usage

What has been changed?

• Updated the worker termination logic to manage multiple active workers using a Map.
• Removed references to the ExitMessage type which is no longer needed.
• Enhanced logging to reflect the current worker index when compiling types.

Before

After

made with gpt-4o-mini using common rules