Implement progress tracking for clique finding

Introduces a mechanism for tracking progress during clique finding operations. This includes implementing a progress bar state management system, handling visibility checks, and integrating progress reporting into the clique finding logic and result processing.

pkg/obidefault/progressbar.go

@@ -1,5 +1,7 @@
 package obidefault
 
+import "os"
+
 var __no_progress_bar__ = false
 
 func ProgressBar() bool {
@@ -17,3 +19,22 @@ func SetNoProgressBar(b bool) {
 func NoProgressBarPtr() *bool {
 	return &__no_progress_bar__
 }
+
+// ProgressBarVisible tells whether a progress bar can be displayed: it is not
+// disabled by --no-progressbar, the standard error output is a terminal and
+// the standard output is not piped to another command.
+func ProgressBarVisible() bool {
+	if !ProgressBar() {
+		return false
+	}
+
+	if e, err := os.Stderr.Stat(); err != nil || (e.Mode()&os.ModeCharDevice) != os.ModeCharDevice {
+		return false
+	}
+
+	if o, err := os.Stdout.Stat(); err == nil && (o.Mode()&os.ModeNamedPipe) == os.ModeNamedPipe {
+		return false
+	}
+
+	return true
+}