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Returns `PONG` if no argument is provided, otherwise return a copy of the
argument as a bulk.
This command is often used to test if a connection is still alive, or to measure
latency.
If the client is subscribed to a channel or a pattern, it will instead return a
multi-bulk with a "pong" in the first position and an empty bulk in the second
position, unless an argument is provided in which case it returns a copy
of the argument.
@return
@simple-string-reply, and specifically `PONG`, when no argument is provided.
@bulk-string-reply the argument provided, when applicable.
@examples
```cli
PING
PING "hello world"
```
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