enhance: support alias with WAL-based DDL framework (#44865)

issue: #43897

- Alias related DDL is implemented by WAL-based DDL framework now.
- Support following message type in wal AlterAlias, DropAlias.
- Alias DDL can be synced by new CDC now.
- Refactor some UT for Alias DDL.

Signed-off-by: chyezh <[email protected]>

Author: chyezh

internal/rootcoord/alter_alias_task.go

@@ -38,6 +38,7 @@ func RegisterDDLCallbacks(core *Core) {
 	}
 	ddlCallback.registerRBACCallbacks()
 	ddlCallback.registerDatabaseCallbacks()
+	ddlCallback.registerAliasCallbacks()
 }
 
 // registerRBACCallbacks registers the rbac callbacks.
@@ -62,6 +63,12 @@ func (c *DDLCallback) registerDatabaseCallbacks() {
 	registry.RegisterDropDatabaseV2AckCallback(c.dropDatabaseV1AckCallback)
 }
 
+// registerAliasCallbacks registers the alias callbacks.
+func (c *DDLCallback) registerAliasCallbacks() {
+	registry.RegisterAlterAliasV2AckCallback(c.alterAliasV2AckCallback)
+	registry.RegisterDropAliasV2AckCallback(c.dropAliasV2AckCallback)
+}
+
 // DDLCallback is the callback of ddl.
 type DDLCallback struct {
 	*Core
@@ -118,3 +125,16 @@ func startBroadcastWithDatabaseLock(ctx context.Context, dbName string) (broadca
 	}
 	return broadcaster, nil
 }
+
+// startBroadcastWithAlterAliasLock starts a broadcast with alter alias lock.
+func startBroadcastWithAlterAliasLock(ctx context.Context, dbName string, collectionName string, alias string) (broadcaster.BroadcastAPI, error) {
+	broadcaster, err := broadcast.StartBroadcastWithResourceKeys(ctx,
+		message.NewSharedDBNameResourceKey(dbName),
+		message.NewExclusiveCollectionNameResourceKey(dbName, collectionName),
+		message.NewExclusiveCollectionNameResourceKey(dbName, alias),
+	)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to start broadcast with alter alias lock")
+	}
+	return broadcaster, nil
+}