feat: published kytos/mef_eline.evcs_loaded when loading evcs during setup

[viniarck]

Closes #400

Summary

See updated changelog file

Local Tests

• Subscribed to it on telemetry_int and confirmed EVCs got published:

2023-11-14 16:27:39,451 - INFO [kytos.napps.kytos/telemetry_int] [main.py:208:on_mef_eline_evcs_loaded] (MainThread) got evcs_loaded {'4ba2a0bd562c4e': {'active': False, 'archived': Fals
e, 'backup_path': [], 'bandwidth': 0, 'circuit_scheduler': [], 'current_path': [], 'dynamic_backup_path': True, 'enabled': True, 'failover_path': [], 'id': '4ba2a0bd562c4e', 'metadata': 
{}, 'name': 'inter_evpl', 'primary_path': [], 'service_level': 6, 'uni_a': {'tag': {'tag_type': 'vlan', 'value': 301}, 'interface_id': '00:00:00:00:00:00:00:01:1'}, 'uni_z': {'tag': {'ta
g_type': 'vlan', 'value': 302}, 'interface_id': '00:00:00:00:00:00:00:03:1'}, 'sb_priority': None, 'execution_rounds': 0, 'owner': None, 'queue_id': -1, 'primary_constraints': {'mandator
y_metrics': {'ownership': 'blue'}}, 'secondary_constraints': {'mandatory_metrics': {'ownership': 'blue'}}, 'primary_links': [], 'backup_links': [], 'start_date': '2023-11-14T19:23:10', '
creation_time': '2023-11-14T19:23:10', 'request_time': '2023-11-14T19:23:10', 'end_date': None, 'flow_removed_at': None, 'updated_at': '2023-11-14T19:27:39'}, '6a6806a80f4d47': {'active'
: False, 'archived': False, 'backup_path': [], 'bandwidth': 0, 'circuit_scheduler': [], 'current_path': [], 'dynamic_backup_path': True, 'enabled': True, 'failover_path': [], 'id': '6a6806a80f4d47', 'metadata': {}, 'name': 'inter_evpl', 'primary_path': [], 'service_level': 6, 'uni_a': {'tag': {'tag_type': 'vlan', 'value': 302}, 'interface_id': '00:00:00:00:00:00:00:01:1
'}, 'uni_z': {'tag': {'tag_type': 'vlan', 'value': 303}, 'interface_id': '00:00:00:00:00:00:00:03:1'}, 'sb_priority': None, 'execution_rounds': 0, 'owner': None, 'queue_id': -1, 'primary
_constraints': {'mandatory_metrics': {'ownership': 'blue'}}, 'secondary_constraints': {'mandatory_metrics': {'ownership': 'blue'}}, 'primary_links': [], 'backup_links': [], 'start_date':
 '2023-11-14T19:23:16', 'creation_time': '2023-11-14T19:23:16', 'request_time': '2023-11-14T19:23:16', 'end_date': None, 'flow_removed_at': None, 'updated_at': '2023-11-14T19:27:39'}}

End-to-End Tests

Not needed for this PR