feat(price-pusher): add market hours updates and metrics tracking

[cctdaniel]

Summary

• Added market hours tracking to price pusher metrics

Rationale

These changes improve the monitoring and alerting system by:

1. Allowing alerts to trigger only during active market hours, reducing false positives
2. Providing better visibility into market status through new metrics:
   • pyth_market_is_open: Whether market is currently open (1) or closed (0)
   • pyth_next_market_open: Next market open time in unix timestamp
   • pyth_next_market_close: Next market close time in unix timestamp
3. Properly handling cleanup to prevent memory leaks and ensure graceful shutdown

Technical Approach

1. Metrics Integration:

   • Added market hours metrics to PricePusherMetrics class
   • Kept metrics class focused solely on metrics management
   • Initialized market hours updates in network command handlers alongside other services

2. Efficient Updates:

   • Market hours are fetched from Pyth API every minute
   • Only process feeds configured in price config file
   • Use child loggers for better log organization
   • Proper cleanup on process termination

How has this been tested?

• Current tests cover my changes
• Added new tests
• Manually tested the code

Testing steps:

1. Verified market hours metrics are only created for configured price feeds
2. Verified metrics are properly updated at 1-minute intervals
3. Checked log output for proper debugging information

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