tools: add new pipewire-dot tool to generate a global objects dot graph
This MR adds a pipewire-dot
tool to generate a global objects dot graph for easy debugging. Several options can be passed to the tool to show different graphs:
--all: will show all pipewire global objects
--detail: will show all global properties
--smart: will only show linked objects
Generated graph examples of a gstreamer pipeline playing audio with pipewire: