central event bus

[ScottyPoi]

Central Event Bus

This PR introduces a new event bus system and refactors the PortalNetwork and BaseNetwork classes to use it instead of extending EventEmitter. This change improves the architecture by decoupling event handling from the network classes and providing a more centralized event management system.

Changes

1. Added new eventBus class and updated types
2. Updated PortalNetwork class to use eventBus instead of extending EventEmitter
3. Updated Network classes to use eventBus instead of extending EventEmitter
4. Updated downstream event calls in the portal network
5. Updated tests to reflect the new event bus implementation