fix: complete the extension

[XZ0730]

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[XZ0730]

fix: √ 1. avoid panic when code start
√ 2. goroutine recover
√ 3. delete change listen (maybe can be some method to optimize)
√ 4. retryContainer init
√ 5. code style
- 6. README.md
√ 7. issue doc

[ppzqh]

@felix021 这个帮忙review一下呢

[li-jin-gou]

参考 kitex-contrib/config-nacos#17 完善一下 readme 和 example

[li-jin-gou]

参考 https://github.com/kitex-contrib/config-nacos/tree/main/licenses 补充 go.mod 直接依赖的 license

[bytedance-oss-robot]

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This pull-request has been approved by: li-jin-gou, ViolaPioggia, XZ0730

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