Variable DefaultGasConfigurationConst

This is mirroring (on a best efforts basis) the network's gas configuration & gas schedule:

• https://gateway.multiversx.com/network/config
• https://github.com/multiversx/mx-chain-mainnet-config/tree/master/gasSchedules
• https://github.com/multiversx/mx-chain-mainnet-config/blob/master/enableEpochs.toml#L200