Allow lambdas as callback

[drdanz]

At the moment, all the callback mechanisms in YARP require writing a class that implement some interface, just to have a method that is called as callback. It would be a lot better to be able to pass lambdas to these functions.
Also in some cases it would be useful to receive a std::future in reply

I'll keep a list here, and link to the related issues and PRs

• yarp::os::Port::setReader() requires a yarp::os::PortReader

  • yarp::os::Port::setReader()
  • Provide callback function to Port::setReader #1927
  • Created wrapper of PortReader to provide port subscribing method. #1945

• yarp::os::Port::getReport() and Port::setReporter() require a yarp::os::PortReport

  • yarp::os::Port::getReport()
  • yarp::os::Port::setReporter()
  • PortReport deprecated in favor of modern callbacks #2045

• yarp::os::Port::write() requires a yarp::os::PortWriter

  • yarp::os::Port::write() 1/2
  • yarp::os::Port::write() 2/2
  • (related tests: Fix ModifyingCarrier tests #2403)

• yarp::os::BufferedPort::useCallback() requires a yarp::os::TypedReaderCallback

  • yarp::os::BufferedPort::useCallback()