Event Bus in Native Java

[taldekar]

Issue #322

Description of changes:
This PR implements a simple event bus using the native Java 9 Reactive Flow library. The purpose of this implementation is to serve as a Proof of Concept.

Key features:

• Utilizes Java 9 Reactive Flow for event publishing and subscription.
• Demonstrates integration with existing codebase.
• Provides asynchronous publish and subscribe functionality using custom thread pools for each respectively.

Current limitations and areas for further investigation:

• Thread pool size's need to be fine-tuned.
• Load testing needs to be performed to ensure that the implementation is scalable and performant.

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