Cardano Updates

Change the time for each call so that ghc is forced to run every loop
itteration.

* Log stat header.
* Formatting stat header & StatPoint.
* Start logging ping statistics only when all clients are ready.  This way we
  don't mix connection messages / warnings with ping statistics.

`concurrently` finishes as soon as one of the threads fails or all exit
cleanly, but we want all the threads to continue until all of them
terminate.

```
nix build .\#cardano-ping-static.x86_64-linux
```

```
nix build .\#cardano-ping-static.x86_64-linux
```

* Log stat header.
* Formatting stat header & StatPoint.
* Start logging ping statistics only when all clients are ready.  This way we
  don't mix connection messages / warnings with ping statistics.

`concurrently` finishes as soon as one of the threads fails or all exit
cleanly, but we want all the threads to continue until all of them
terminate.

Round handshake and chain sync rtt to milliseconds (as we do for keep
alive rtts).

Let's hard code `PerasSupported`, which allows to query nodes if they
support Peras without breaking nodes which don't support it.

Changed the format to log one JSON encoded message per line.  When we
logged a list of messages as JSON output, they get interleaved with
other messages, making the output not a valid JSON unless quiet mode was
used.

Ping runs in either of the two modes query tip of ping, so a sum type is
better than a product of two boolean values.

Shorten the timeout to 1 second.

Moved the delay from each client to the main thread.  This way the
output is written quicker to stdout.