feat(apps/price_pusher): add prom metrics

[cctdaniel]

Summary

Added comprehensive monitoring capabilities to the price_pusher service, including:

• Prometheus metrics for tracking service health, performance, and wallet balances
• Grafana dashboard configuration for visualizing metrics
• Alerting configuration for critical service conditions
• Docker Compose setup for easy deployment of the monitoring stack
• Documentation updates in README for monitoring features

Rationale

These changes are necessary to improve the observability of the price_pusher service, enabling operators to:

1. Monitor the health and performance of price feeds in real-time
2. Track wallet balances to prevent transaction failures due to insufficient funds
3. Receive timely alerts when issues occur
4. Easily deploy and configure the monitoring infrastructure
5. Have comprehensive documentation on the monitoring capabilities

How has this been tested?

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

The monitoring functionality has been manually verified by:

1. Running the service with metrics enabled
2. Confirming metrics are correctly exposed on the configured port
3. Testing the Docker Compose setup to ensure Prometheus and Grafana services start correctly
4. Verifying that metrics are properly collected in Prometheus
5. Confirming the Grafana dashboard displays all metrics as expected
6. Testing alert conditions to ensure they trigger appropriately
7. Validating wallet balance tracking accurately reflects on-chain balances

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[ali-bahjati]

I like the code now. The only request i have is to respect the design structure of the code. I recommend you add the balance tracker interface to the top interfaces.ts and later implement the one for evm in the evm directory.

[ali-bahjati]

Nice! can you bump the version as well?