[Enhancement] NettyRemotingClient#createChannelAsync一开始的get操作是冗余的

[PleaseGiveMeTheCoke]

Before Creating the Enhancement Request

• I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

createChannelAsync方法的一开始 ，执行了get操作

而createChannelAsync方法的调用方getAndCreateChannelAsync方法中，已经执行过同样的get操作了。这段 get 操作不应该在 createChannelAsync方法中进行，因为这个方法的命名是 createChannelAsync。

Motivation

1. 目前getAndCreateChannelAsync方法相当于执行了两次同样的get操作
2. 目前createChannelAsync的方法命名和具体职责存在不一致
3. 优化后可以提升性能（少了一次get操作），提高代码的可读性

Describe the Solution You'd Like

删除下面的代码

并在该方法的另一处调用方getAndCreateNameserverChannelAsync中，调用之前加上get操作

Describe Alternatives You've Considered

无

Additional Context

No response

[qianye1001]

Double-Check Locking is the standard process for preventing concurrent creation. Creation only occurs once when the connection is established. Reducing one in-memory check won't provide any significant performance improvement.

[qianye1001]

It is more recommended to remove check in getAndCreateChannelAsync