Lim Zhi Xuan

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### Community Note * Please vote on this issue by adding a 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to the original issue to help the community and maintainers prioritize this request * Please do...

feat: support Kubernetes service discovery

9

Primarily to support `client.token_file` in APISIX's [Kubernetes service discovery configuration](https://apisix.apache.org/docs/apisix/discovery/kubernetes/#configuration).