Generalize UI events for cataloging tasks (#2369)

* generalize ui events for cataloging tasks

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* moderate review comments

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* incorporate review comments

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* rename cataloger task progress object

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* migrate cataloger task fn to bus helper

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

internal/bus/helpers.go

@@ -2,10 +2,12 @@ package bus
 
 import (
 	"github.com/wagoodman/go-partybus"
+	"github.com/wagoodman/go-progress"
 
 	"github.com/anchore/clio"
 	"github.com/anchore/syft/internal/redact"
 	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/event/monitor"
 )
 
 func Exit() {
@@ -33,3 +35,18 @@ func Notify(message string) {
 		Value: message,
 	})
 }
+
+func StartCatalogerTask(info monitor.GenericTask, size int64, initialStage string) *monitor.CatalogerTaskProgress {
+	t := &monitor.CatalogerTaskProgress{
+		AtomicStage: progress.NewAtomicStage(initialStage),
+		Manual:      progress.NewManual(size),
+	}
+
+	Publish(partybus.Event{
+		Type:   event.CatalogerTaskStarted,
+		Source: info,
+		Value:  progress.StagedProgressable(t),
+	})
+
+	return t
+}