Changes in the implementation and Gateway for model-treatment added

[educanovas93]

This PR implements the mocked functionality for model aggregation and updates in the Hyperledger Fabric chaincode. The implementation includes two main chaincodes: model-aggregation and model-updates, which pretend to handle the federated learning model aggregation process.

Key Changes:

Added model aggregation chaincode with:

• Matrix conversion utilities for handling float64 data
• Model update calculation and aggregation logic
• State management for aggregated models

Added model updates chaincode for:

• Handling individual model updates
• State management for model versions
• Integration with the DLT operations