[handlers]: Consistent run and execute_command

`run` and `execute_command` are two interfaces for each handler. The former is for command-line usage while the latter is used when using programatically.

Technically both should perform the same function with `run` calling `execute_command` and parsing/pretty printing it's output. But right now, that is not the case for all of them. Most of the `execute_command` implement the functionality for the orchestration.

Either have it consistent or drop it as a common interface.