[ISSUE#3241]Just Reformat the nacos-config module by new code style.

[zongtanghu]

Please do not create a Pull Request without creating an issue first.

What is the purpose of the change

(1).Reformat the nacos-config module by new code style.
(2).You can see the related issue's link: #2992.

Brief changelog

XX

Verifying this change

XXXX

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[zongtanghu]

I have already just reformated the config module in the nacos, and put forward a pr. @KomachiSion

[zongtanghu]

Because there are lots of file in the config module, the effected line is too many. @KomachiSion