feat: mulitcast

[boecklim]

Description of Changes

Rebased version of #728

Add Hybrid Blockchain Communication Using Multicast Groups

Key Changes

1. Hybrid Communication Mode

• Introduced a new communication method called hybrid, which combines p2p communication with a multicast group-based mechanism.
• Services can now switch between classic (current approch with p2p connection only) and hybrid communication modes,

2. Transparent Integration for Services

• The communication method is abstracted from the services, ensuring seamless integration without requiring modifications to service logic when communication mode is changed.
• To achieve this, mediating structures, such as a mediator in metamorph, were implemented to handle message translation and routing between p2p and multicast groups.

3. New Structures and Improvements

• Designed and implemented the multicast communication logic, including message handling and group management.
• Enhanced modularity and maintainability by encapsulating the communication logic in dedicated components.

Benefits

• Flexibility: Provides a flexible and future-proof communication layer that can adapt to different blockchain network configurations.
• Backward Compatibility: Transparent integration ensures compatibility with existing p2p setups.

Linked Issues / Tickets

Reference any related issues or tickets, e.g. "Closes #123".

Testing Procedure

Describe the tests you've added or any testing steps you've taken.

• I have added new unit tests
• All tests pass locally
• I have tested manually in my local environment

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have updated CHANGELOG.md with my changes

[sonarqubecloud]

Quality Gate failed

Failed conditions
53.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud