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.dto.ts

@@ -40,6 +40,11 @@ export class EventDto {
     useTLS?: boolean;
     events?: string[];
   };
+
+  kafka?: {
+    enabled?: boolean;
+    events?: string[];
+  };
 }
 
 export function EventInstanceMixin<TBase extends Constructor>(Base: TBase) {
@@ -82,5 +87,10 @@ export function EventInstanceMixin<TBase extends Constructor>(Base: TBase) {
       useTLS?: boolean;
       events?: string[];
     };
+
+    kafka?: {
+      enabled?: boolean;
+      events?: string[];
+    };
   };
 }