Initial commit for Waybar JACK monitoring module

-DSP load
  -xruns
  -connected/disconnected state
  -only tested with Pipewire so far but should work with JACK2 as well

 On branch dsp
 Changes to be committed:
	modified:   include/factory.hpp
	new file:   include/modules/jack.hpp
	modified:   meson.build
	modified:   meson_options.txt
	modified:   src/factory.cpp
	new file:   src/modules/jack.cpp

include/factory.hpp

@@ -67,6 +67,10 @@
 #include "modules/custom.hpp"
 #include "modules/temperature.hpp"
 
+#ifdef HAVE_LIBJACK
+#include "modules/jack.hpp"
+#endif
+
 namespace waybar {
 
 class Factory {