pw-profiler: add profiler tool

Add Profiler object and fields.
Add profiler extension API. It notifies Profiler objects with
real-time performance data.
Add module that implements the profiler extension.
Add pw-profiler tool that binds to the profiler API and dumps the
data into a log file, gnuplot files, a html page and a script to
generate svg graphs. This is almost the same as what JACK2
JackEngineProfiling does.

src/tools/meson.build

@@ -17,6 +17,13 @@ executable('pw-dot',
 	dependencies : [pipewire_dep],
 )
 
+executable('pw-profiler',
+	'pw-profiler.c',
+	c_args : [ '-D_GNU_SOURCE' ],
+	install: true,
+	dependencies : [pipewire_dep],
+)
+
 if get_option('pw-cat') and sndfile_dep.found()
 
   pwcat_sources = [