Make bump gas price minimum configurable, now it is 1gwei

[tomasklim]

Related to #15816

Bump fee logic should be updated here

const getEthereumFeeInfo = (info: FeeInfo, gasPrice: string) => {
    const current = new BigNumber(gasPrice);
    const minFeeFromNetwork = new BigNumber(fromWei(info.levels[0].feePerUnit, 'gwei'));

    const getFee = () => {
        if (minFeeFromNetwork.lte(current.plus(1))) {
            return current.plus(1);
        }

        return minFeeFromNetwork;
    };
...

I think we should introduce min bump amount into the config file where you modify minFee, maxFee,... and use it in this function instead of 1`