Add test code and RPC for TPS benchmark #929

By environment

• Code with SDK
  This is for checking TPS in the network.
• RPC
  This is for checking TPS in the single machine.

By method(scenario)

• Payment parcels only, with the same account
• Transfer one asset type, from one to another one
• Transfer one asset type, from many to many
• Payment parcel or one-to-one transfer transaction parcel randomly