Volatile Type ID (Vtid) generator.

How it works

1. Each time a crate is recompiled, a counter in a lock file is incremented to create a new version
2. This version becomes the base ID for all types in that compilation unit
3. When combined with type information, it creates unique IDs that:
   • Are consistent for the same type within one compilation
   • Automatically version bump on recompilation
   • Allow tracking type changes across hot reloads
   • Maintain thread-safety through file locking

The versioning ensures that if a type's definition changes and the crate is recompiled, the old and new versions of the type will have different IDs.