[monitoring] Add support of DataDog

[uro]

I would like to be able to display the enqueue statistics in DataDog.

Should I add the support of datadog to your monitoring package as is the wamp and influxdb?
Or should I solve it externally?

If you like to see DataDog as a new monitoring provider, I'll be happy to implement it.

https://github.com/DataDog/php-datadogstatsd

@makasim

[makasim]

That would be a great addition.

[makasim]

There is a PR, closing