feat(kafka): add Kafka integration for event streaming

- Introduced Kafka support in the Evolution API, allowing for real-time event streaming and processing.
- Updated environment configuration to include Kafka-related variables.
- Added KafkaController and KafkaRouter for managing Kafka events.
- Enhanced event management to support Kafka alongside existing integrations.
- Updated database schemas and migrations for Kafka integration in both MySQL and PostgreSQL.
- Documented Kafka integration in the README file.

.env.example

@@ -190,6 +190,60 @@ PUSHER_EVENTS_CALL=true
 PUSHER_EVENTS_TYPEBOT_START=false
 PUSHER_EVENTS_TYPEBOT_CHANGE_STATUS=false
 
+# Kafka - Environment variables
+KAFKA_ENABLED=false
+KAFKA_CLIENT_ID=evolution-api
+KAFKA_BROKERS=localhost:9092
+KAFKA_CONNECTION_TIMEOUT=3000
+KAFKA_REQUEST_TIMEOUT=30000
+# Global events - By enabling this variable, events from all instances are sent to global Kafka topics.
+KAFKA_GLOBAL_ENABLED=false
+KAFKA_CONSUMER_GROUP_ID=evolution-api-consumers
+KAFKA_TOPIC_PREFIX=evolution
+KAFKA_NUM_PARTITIONS=1
+KAFKA_REPLICATION_FACTOR=1
+KAFKA_AUTO_CREATE_TOPICS=false
+# Choose the events you want to send to Kafka
+KAFKA_EVENTS_APPLICATION_STARTUP=false
+KAFKA_EVENTS_INSTANCE_CREATE=false
+KAFKA_EVENTS_INSTANCE_DELETE=false
+KAFKA_EVENTS_QRCODE_UPDATED=false
+KAFKA_EVENTS_MESSAGES_SET=false
+KAFKA_EVENTS_MESSAGES_UPSERT=false
+KAFKA_EVENTS_MESSAGES_EDITED=false
+KAFKA_EVENTS_MESSAGES_UPDATE=false
+KAFKA_EVENTS_MESSAGES_DELETE=false
+KAFKA_EVENTS_SEND_MESSAGE=false
+KAFKA_EVENTS_SEND_MESSAGE_UPDATE=false
+KAFKA_EVENTS_CONTACTS_SET=false
+KAFKA_EVENTS_CONTACTS_UPSERT=false
+KAFKA_EVENTS_CONTACTS_UPDATE=false
+KAFKA_EVENTS_PRESENCE_UPDATE=false
+KAFKA_EVENTS_CHATS_SET=false
+KAFKA_EVENTS_CHATS_UPSERT=false
+KAFKA_EVENTS_CHATS_UPDATE=false
+KAFKA_EVENTS_CHATS_DELETE=false
+KAFKA_EVENTS_GROUPS_UPSERT=false
+KAFKA_EVENTS_GROUPS_UPDATE=false
+KAFKA_EVENTS_GROUP_PARTICIPANTS_UPDATE=false
+KAFKA_EVENTS_CONNECTION_UPDATE=false
+KAFKA_EVENTS_LABELS_EDIT=false
+KAFKA_EVENTS_LABELS_ASSOCIATION=false
+KAFKA_EVENTS_CALL=false
+KAFKA_EVENTS_TYPEBOT_START=false
+KAFKA_EVENTS_TYPEBOT_CHANGE_STATUS=false
+# SASL Authentication (optional)
+KAFKA_SASL_ENABLED=false
+KAFKA_SASL_MECHANISM=plain
+KAFKA_SASL_USERNAME=
+KAFKA_SASL_PASSWORD=
+# SSL Configuration (optional)
+KAFKA_SSL_ENABLED=false
+KAFKA_SSL_REJECT_UNAUTHORIZED=true
+KAFKA_SSL_CA=
+KAFKA_SSL_KEY=
+KAFKA_SSL_CERT=
+
 # WhatsApp Business API - Environment variables
 # Token used to validate the webhook on the Facebook APP
 WA_BUSINESS_TOKEN_WEBHOOK=evolution