Squashed commit of the following:

commit 32f4b1a13057d56b6de487cdb80ff7c205af01a6
Author: chrislu <chris.lu@gmail.com>
Date:   Sun Aug 20 22:52:19 2023 -0700

    fix compilation

commit e77ad33b7ca0423138fbae26a4433b60923a9588
Author: chrislu <chris.lu@gmail.com>
Date:   Sun Aug 20 22:46:44 2023 -0700

    pub

commit f431f30cc7ca277ca299e3cd118c05537fb9f5c3
Author: chrislu <chris.lu@gmail.com>
Date:   Sun Aug 20 13:27:39 2023 -0700

    fix generic type

commit 4e9dcb18293fd1e3e306e2dceb995dfd67a35e1d
Merge: 30f942580 16e3f2d52
Author: chrislu <chris.lu@gmail.com>
Date:   Sun Aug 20 12:47:14 2023 -0700

    Merge branch 'master' into pubsub

commit 30f942580ad1bb32ae94aade2e3a21ec3ab63e21
Author: chrislu <chris.lu@gmail.com>
Date:   Sun Aug 20 11:10:58 2023 -0700

    wip

commit f8b00980bc2f3879bb43decffd9a08d842f196f2
Author: chrislu <chris.lu@gmail.com>
Date:   Tue Jul 25 09:14:35 2023 -0700

    add design document

commit 08d2bebe42a26ebc39f1542f54d99e73620727dd
Author: chrislu <chris.lu@gmail.com>
Date:   Tue Jul 25 09:14:06 2023 -0700

    minor

commit bcfa7982b262a40fcdce6fc6613fad2ce07c13da
Author: chrislu <chris.lu@gmail.com>
Date:   Tue Jul 25 09:13:49 2023 -0700

    rename

weed/mq/topic/local_topic.go

@@ -0,0 +1,29 @@
+package topic
+
+type LocalTopic struct {
+	Topic
+	Partitions []*LocalPartition
+}
+
+func (localTopic *LocalTopic) findPartition(partition Partition) *LocalPartition {
+	for _, localPartition := range localTopic.Partitions {
+		if localPartition.Partition.Equals(partition) {
+			return localPartition
+		}
+	}
+	return nil
+}
+func (localTopic *LocalTopic) removePartition(partition Partition) bool {
+	foundPartitionIndex := -1
+	for i, localPartition := range localTopic.Partitions {
+		if localPartition.Partition.Equals(partition) {
+			foundPartitionIndex = i
+			break
+		}
+	}
+	if foundPartitionIndex == -1 {
+		return false
+	}
+	localTopic.Partitions = append(localTopic.Partitions[:foundPartitionIndex], localTopic.Partitions[foundPartitionIndex+1:]...)
+	return true
+}