Add output adapter to output port for persisting data in memory

[davidgaspardev]

The goal is to implement an output adapter for the output port (TrainingRepository) to ensure that data is persisted in memory.

Tasks:

1. Identify the appropriate methods in the TrainingRepository where the adapter needs to be integrated.
2. Implement the in-memory persisting mechanism.

Acceptance Criteria:

• Ensure data is correctly persisted in memory for all relevant operations.
• Add unit tests to validate the functionality.

[Eugod]

✅ Implementado

PR criado: #2