Issue-3092 Add source support to wireplumber module

- Adds microphone support etc to the wireplumber module.

  The existing module hardcodes the selected node type to "Audio/Sink". This feature allows the user to override this
  via `"node-type": "Audio/Source"`.

- Unlike the pulseaudio module, this change does not try to see the module manage both input and output. The same effect
  can be achieved by running two instances of the wireplumber module.

  This approach:
  - Works around some of the complexity overhead that seem to have caused similar PRs to stall.
  - Using separate module instances also allows both the microphone and speaker levels to be controlled with a scroll
    wheel. This is something a unified module like pulseaudio struggles with.
  - Similarly, separate instances allows the source volume level to be exposed as the state. Ie- the linear-gradient
    css patterns can be applied to both input and output.

man/waybar-wireplumber.5.scd

@@ -19,6 +19,11 @@ The *wireplumber* module displays the current volume reported by WirePlumber.
 	typeof: string ++
 	This format is used when the sound is muted.
 
+*node-type*: ++
+	typeof: string ++
+	default: *Audio/Sink* ++
+	The WirePlumber node type to attach to. Use *Audio/Source* to manage microphones etc.
+
 *tooltip*: ++
 	typeof: bool ++
 	default: *true* ++
@@ -108,6 +113,8 @@ The *wireplumber* module displays the current volume reported by WirePlumber.
 
 # EXAMPLES
 
+## Basic:
+
 ```
 "wireplumber": {
 	"format": "{volume}%",
@@ -116,6 +123,26 @@ The *wireplumber* module displays the current volume reported by WirePlumber.
 }
 ```
 
+## Separate Sink and Source Widgets 
+
+```
+"wireplumber#sink": {
+    "format": "{volume}% {icon}",
+    "format-muted": "",
+    "format-icons": ["", "", ""],
+    "on-click": "helvum",
+    "on-click-right": "wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle",
+    "scroll-step": 5
+},
+"wireplumber#source": {
+    "node-type": "Audio/Source",
+    "format": "{volume}% ",
+    "format-muted": "",
+    "on-click-right": "wpctl set-mute @DEFAULT_AUDIO_SOURCE@ toggle",
+    "scroll-step": 5
+}
+```
+
 # STYLE
 
 - *#wireplumber*