feat: implement individual asset heartbeats#4
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Description: Implement Per-Asset Heartbeat
Overview
This PR addresses a critical security vulnerability where the price lacked a mechanism to verify data freshness. By transitioning to a Heartbeat-based Model, we ensure the contract only accepts chronologically newer data, protecting downstream protocols from stale price injection.
Key Changes
PriceDatastruct encapsulating bothpriceandlastUpdatedheartbeat.