[AI-6470] Add EventBusOrchestrator to ddev

[AAraKKe]

What does this PR do?

This PR introduces a new, abstract Event Bus implementation designed to serve as the foundation for the future TestDispatcher. It provides a flexible framework for decoupled task execution and message processing.

The core components are:

• EventBusOrchestrator: Manages the lifecycle of the event loop, handles message routing, and ensures tasks are executed within defined timeout constraints.
• BaseTask: An abstract base class for defining units of work. Tasks subscribe to specific message types and can define custom success and error handling logic.
• BaseMessage: A dataclass-based structure for defining the data payload passed between tasks.

Motivation

This is the foundation of the TestDispatcher that we will be developed to orchestrate unit tests through GitHub actions.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

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[codecov]

Codecov Report

❌ Patch coverage is 97.17949% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.77%. Comparing base (695ff3e) to head (97fb754).
⚠️ Report is 1 commits behind head on master.

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