enhance EdgeCloud iface, i2Edge client & fix tests for CAMARA compliance

- Reorganize client code with clear CAMARA/GSMA API section separation
- Implement CAMARA-compliant schemas and response formatting for all operations
- Add comprehensive CAMARA validation for application lifecycle operations
- Update test configurations with real i2Edge endpoints and CAMARA payloads
- Enhance error handling and standardize response patterns across adapters
- Remove deprecated utility functions and improve code organization