spark-dashboard v2.0

This release of spark-dashboard contains:

• Implementations of Spark dashboards for monitoring Spark workloads
• Docker files and associated images on Docker Hub
• spark-dashboard v2 Docker image: with Telegraf, VictoriaMetrics and Grafana with PromQL
• spark-dashboard v1 Docker image: with InfluxDB and Grafana with InfluxQL
• spark-dashboard v1 Helm chart