chore: aria2 related function

pkg/generic_sync/map.go

@@ -347,6 +347,13 @@ func (m *MapOf[K, V]) Values() []V {
 	return values
 }
 
+func (m *MapOf[K, V]) Clear() {
+	m.Range(func(key K, value V) bool {
+		m.Delete(key)
+		return true
+	})
+}
+
 func (m *MapOf[K, V]) missLocked() {
 	m.misses++
 	if m.misses < len(m.dirty) {

pkg/task/manager.go

@@ -75,6 +75,12 @@ func (tm *Manager) Remove(tid uint64) {
 	tm.tasks.Delete(tid)
 }
 
+// RemoveAll removes all tasks from the manager, this maybe shouldn't be used
+// because the task maybe still running.
+func (tm *Manager) RemoveAll() {
+	tm.tasks.Clear()
+}
+
 func (tm *Manager) RemoveFinished() {
 	tasks := tm.GetAll()
 	for _, task := range tasks {