Event Bus:

Make MainBus#get static instead of instance method to allow users to utilise the provided MainBus

Service API:

Fix ClassLoaderServiceLoader not working in module environments by declaring Module#addUses

Add MutableServiceLayer for manual service layers and create factory method for configuring them

Registry:

Add static factory methods to create MutableMappedIdRegistry and MutableKeylessRegistry instances

Other:

Add demo subproject (CC0 license) showcasing features and how to use eventbus, registry and service api

Update build workflow to publish demo artifact

Add release github workflow to automatically publish artifacts when a release is created

Promote config helpers, registry and service api from WIP to experimental

Update README with event bus demo image