feat(grafana): add Alys V2 dashboards and Prometheus datasource configuration

- Introduced a new Grafana dashboard configuration for Alys V2, providing an overview of key metrics including chain height, sync status, network peers, and block production rates.
- Added Prometheus as the default datasource for Grafana, enabling seamless integration for monitoring.
- Created a provisioning YAML file for Grafana dashboards to auto-load configurations from the specified directory.
- Established a Prometheus configuration to scrape metrics from Alys nodes and the Reth execution layer, enhancing observability in the two-node regtest environment.

Author: michaelgpt