Add RTMS Echo sensor driver

[DougLau]

• Add new pollinator service (Rust)
• Document binary vehicle event .vlg format
• Implement basic RTMS Echo protocol
• Add WebSocket Ping/Pong support to pollinator
• Write vehicle events to .vlg files
• Read detector configuration from tms DB
• Listen for DB notifications and refresh pollers on changes
• Update controller fail_time on success / failure change
• Add method to send binned data to IRIS server after each interval
• Add support to Mayfly for reading .vlg files
• Automatically reconnect after comm. errors