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.

src/api/integrations/event/event.schema.ts

@@ -22,6 +22,9 @@ export const eventSchema: JSONSchema7 = {
     sqs: {
       $ref: '#/$defs/event',
     },
+    kafka: {
+      $ref: '#/$defs/event',
+    },
   },
   $defs: {
     event: {