modules: move the scheduler to a module

Mostly because we can but also because there are more ways of doing
the scheduling and this opens the door for some experimentation.

src/daemon/minimal.conf.in

@@ -100,6 +100,10 @@ context.modules = [
         }
         flags = [ ifexists nofail ]
     }
+    # the graph scheduler
+    { name = libpipewire-module-scheduler-v1
+        condition = [ { module.scheduler-v1 = !false } ]
+    }
 
     # The native communication protocol.
     { name = libpipewire-module-protocol-native }

src/daemon/pipewire.conf.in

@@ -121,6 +121,10 @@ context.modules = [
         flags = [ ifexists nofail ]
         condition = [ { module.rt = !false } ]
     }
+    # the graph scheduler
+    { name = libpipewire-module-scheduler-v1
+        condition = [ { module.scheduler-v1 = !false } ]
+    }
 
     # The native communication protocol.
     { name = libpipewire-module-protocol-native