Introduce a migration tool to transfer legacy config file to new config file

As we transition to new configuration files that adhere to the standard YAML format, users are expected to manually migrate their existing config files. However, this process can be error-prone and time-consuming.

To simplify the migration, we're introducing an automated script. This script leverages BashJavaUtils to efficiently convert old flink-conf.yaml files into the new config file config.yaml, thereby reducing the effort required for migration.