Add support for extension manager

[kaklakariada]

In order to support the extension mananger we need to add an extension that manages the Kafka connector.

Steps for installation

See user guide:

• Upload adapter jar to bucketfs ✅
• Create three UDF scripts ✅
• Create Exasol table with columns KAFKA_PARTITION DECIMAL(18, 0), KAFKA_OFFSET DECIMAL(36, 0) ❌
• Run import with IMPORT INTO <schema_name>.<table_name> FROM SCRIPT KAFKA_CONSUMER WITH ... ❌
• If required: create connection with IDENTIFIED BY 'SSL_KEY_PASSWORD=<PASSWORD>;SSL_KEYSTORE_PASSWORD=<SSLPASSWORD>;SSL_KEYSTORE_LOCATION=/buckets/bfsdefault/<BUCKET>/keystore.jks;SSL_TRUSTSTORE_PASSWORD=<TRUSTSTOREPASS>;SSL_TRUSTSTORE_LOCATION=/buckets/bfsdefault/<BUCKET>/truststore.jks' ❌