[SDK] Fixed Gas Price on Aurora Networks #3516

Description
Currently, the HUMAN Protocol SDK relies on the default provider gas estimation when interacting with Aurora (both mainnet and testnet). However, Aurora operates with a fixed gas price of 0.07GWei, which makes gas estimation unnecessary and their RPCs do not support it.

We should add some kind of a middleware that ensures a fixed gas price is always used when sending transactions through the SDK on Aurora networks.

Motivation
Avoid extra gas cost on transactions

Implementation details

• Detect if the current chainId corresponds to Aurora mainnet (1313161554) or Aurora testnet (1313161555).
• Automatically set the gas price to 0.07Gwei before sending the transaction.
• Expose a configuration option to override the fixed gas price if needed.