sdk uses explorer RPC endpoint by default #15
Description
This is wrong: https://github.com/0LNetworkCommunity/open-libra-sdk/blob/main/src/client/client.ts#L17
because the explorer RPC endpoint isn't a general public RPC service. It can go down (for example today) and it isn't provisioned to be the world's RPC service for Libra. We have the playlist for that.