Refactor code structure for improved readability and maintainability

[dolaoluwa574-source]

closes #280

Summary:
Implements dynamic transaction fee estimation and surge pricing logic to improve fee accuracy and reduce failed transactions during periods of high network demand.

Key changes:

• Adds dynamic fee estimation based on current network conditions
• Implements surge pricing behavior to adjust fees during congestion
• Adds or updates relevant service/module logic for fee calculation
• Ensures safe fallbacks to base fees and caps to prevent excessive spikes
• Includes tests and validation for new pricing behavior

Why this matters:
This change improves transaction reliability by making fees adaptive to real-time network conditions, helping users avoid underpriced transactions during surges while still keeping fees reasonable in normal conditions.