feat: comprehensive Prometheus integration with full pipeline support

[andrewm4894]

• Add Prometheus as database option with read/write capabilities
• Implement prometheus_db example demonstrating Prometheus as both source and destination
• Create modular Prometheus query functions (train, score, alert, change, llmalert)
• Add SQL-to-PromQL conversion layer in anomstack/sql/read.py
• Fix timestamp handling for Prometheus remote write (sort by timestamp, use actual timestamps)
• Implement metric type suffixes (_anomaly_score, _alert, _llm_alert, _threshold_alert)
• Add Prometheus testing stack with docker-compose.prometheus.yaml
• Update ingest function to use instant queries to avoid out-of-order samples
• Make train job configuration-driven using prometheus_queries from YAML
• Add comprehensive error handling and logging for Prometheus operations
• Update Makefile with prometheus-up/down/logs/test targets

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