Use RPC to get the minimum transaction fee

[sgkim126]

codechain-sdk-js/src/rpc/chain.ts

Lines 1469 to 1494 in 47ddeaf

	export function getMinimumFee(tx: Transaction): number {
	switch (tx.type()) {
	case "pay":
	return 100;
	case "setRegularKey":
	return 10000;
	case "store":
	return 5000;
	case "remove":
	return 5000;
	case "mintAsset":
	return 100000;
	case "transferAsset":
	return 100;
	case "changeAssetScheme":
	return 100000;
	case "increaseAssetSupply":
	return 100000;
	case "wrapCCC":
	return 100000;
	case "unwrapCCC":
	return 100;
	default:
	return 10;
	}
	}

Currently, the minimum fee is hardcoded.
Please change it to use chain_getMinTransactionFee