Create and send a transaction using 1 CLI command

[bobanm]

Description

It would be a big improvement to user experience if there was also a way to create and send a transaction in only 1 step. For example, by adding --send flag to transaction:create command.

Motivation

The process of creating and sending a transaction using CLI is currently quite cumbersome. A user needs to:

1. Use transaction:create to create a transaction
2. Copy the encoded transaction
3. Paste the encoded transaction as an argument of transaction:send command

Having this many steps makes the process more tedious, clunky and error-prone.