Fix the deadlock while using zookeeper thread to create ledger (apach…

…e#13744)

### Motivation

Fixes: apache#13736, the deadlock when using ZK thread to create a ledger.

### Modification

Use the executor of the managed ledger to create the ledger to avoid the deadlock.

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java

@@ -1638,7 +1638,10 @@ synchronized void createLedgerAfterClosed() {
             STATE_UPDATER.set(this, State.CreatingLedger);
             this.lastLedgerCreationInitiationTimestamp = System.currentTimeMillis();
             mbean.startDataLedgerCreateOp();
-            asyncCreateLedger(bookKeeper, config, digestType, this, Collections.emptyMap());
+            // Use the executor here is to avoid use the Zookeeper thread to create the ledger which will lead
+            // to deadlock at the zookeeper client, details to see https://github.com/apache/pulsar/issues/13736
+            this.executor.execute(() ->
+                    asyncCreateLedger(bookKeeper, config, digestType, this, Collections.emptyMap()));
         }
     }