Updates

[cyypherus]

• Reconnect & replay when tcp connection is reset upstream
• Adds update buffering to prevent disconnects when a handler is slow or when update rate spikes
• Switches from jetstream to firehose, removes dependency on jetstream-oxide
• Enables service of multiple feeds in one feed server
• Adds verification of multiple feeds & multiple pages into the verify bin
• Implements a high throughput sqlite example that serves multiple feeds from one database