Video Surveillance with NebulaStream integration

This release of Video Surveillance integrates the NebulaStream operators and replaces the apache flink framework used in version v0.1.0-flink

Full Changelog: v0.1.0-flink...v0.2.0-nebulastream

Interim Video surveillance release

Initial release of video surveillance with Apache Flink support.

Full Changelog: https://github.com/elegant-h2020/video-surveillance-ubi-uc/commits/v0.1.0-flink