Add functionality to map kafka-headers into http headers

examples/kafka-hub/hub/websub_subscribers.bal

@@ -131,7 +131,20 @@ isolated function deSerializeKafkaRecord(kafka:ConsumerRecord kafkaRecord) retur
     json payload =  check value:fromJsonString(message);
     websubhub:ContentDistributionMessage distributionMsg = {
         content: payload,
-        contentType: mime:APPLICATION_JSON
+        contentType: mime:APPLICATION_JSON,
+        headers: check getHeaders(kafkaRecord)
     };
     return distributionMsg;
 }
+
+isolated function getHeaders(kafka:ConsumerRecord kafkaRecord) returns map<string|string[]>|error {
+    map<string|string[]> headers = {};
+    foreach var ['key, value] in kafkaRecord.headers.entries().toArray() {
+        if value is string || value is string[] {
+            headers['key] = value;
+        } else if value is byte[] {
+            headers['key] = check string:fromBytes(value);
+        }
+    }
+    return headers;
+}