Secure Kafka docs (#71)

Add details tutorials and example deployment files for connecting Flink SQL to various types of secure Kafka listeners.

Co-authored-by: Thomas Cooper <[email protected]>
Co-authored-by: Kate Stanley <[email protected]>

Author: 3 people

.github/scripts/setVersions.sh

@@ -8,3 +8,4 @@ fi
 mvn -B versions:set -DgenerateBackupPoms=false -DnewVersion=${1}
 sed --in-place --regexp-extended "s|flink-examples-data-generator:([^[:space:]]*)|flink-examples-data-generator:${2}|g" tutorials/recommendation-app/data-generator.yaml
 sed --in-place --regexp-extended "s|flink-sql-runner-with-flink-udf-currency-converter:([^[:space:]]*)|flink-sql-runner-with-flink-udf-currency-converter:${2}|g" tutorials/user-defined-functions/standalone-etl-udf-deployment.yaml
+sed --in-place --regexp-extended "s|flink-examples-data-generator:([^[:space:]]*)|flink-examples-data-generator:${2}|g" tutorials/secure-kafka/data-generator/data-generator.yaml