[Feat]:  Split Axon core code

### Is there an existing issue that is already proposing this?

- [x] I have searched the existing issues

### 🪄 describe your feature or idea

I need to split Axon Core code for cleaner and more readable code because currently it's too messy and not ready for maintainers to contribute in project.
Also I have to improve its performance, search for bottlenecks and find a solution for them.