fix: improve Gas Fee Estimation by Integrating Filecoin's EIP-1559-Compatible APIs

[karlem]

Close #1175
Close #982

This PR updates our gas fee estimation to leverage the eth_maxPriorityFeePerGas and eth_getBlockByNumber (to retrieve the current base_fee_per_gas from the latest mined block) API calls, using Eth-standard APIs available through Filecoin. Since Filecoin supports EIP-1559, these calls are fully compatible with Filecoin's implementation, aligning with standard EVM practices and ensuring interoperability across EVM chains.

Key Changes:

• The max_priority_fee_per_gas() and base_fee_per_gas() functions retrieve gas fee estimates based on Filecoin's adherence to EIP-1559.
• Gas fee calculation buffers the base fee with a multiplier of 2 to accommodate potential cumulative increases, aligning with the 12.5% maximum cap on base fee growth per block. By doubling the base fee, we account for possible surges in consecutive blocks, ensuring that estimates remain responsive to rapid market changes while providing a buffer for handling block-to-block volatility.

This approach simplifies our fee estimation logic by utilizing available EIP-1559-compatible APIs, improving chances of capturing better gas market dynamics on specific networks (Filecoin in this case) to increase chance of fast transaction inclusion within a block.