feat: support Discovery Center - PolarisMesh

[Maple-mxf]

Description

polarismesh是腾讯开源的注册中心，里面包含了对于grpc框架的sdk支持，使得grpc拥有了微服务的治理能力。 apisix拥有grpc-transcode协议转换能力，配合polarismesh注册中心，能够为grpc开使用者带来巨大好处

[tokers]

@Maple-mxf Could you provide more materials about polarismesh? Such as its documentation, API reference.

[Maple-mxf]

polarismesh website：https://polarismesh.cn/ polarismesh github repo：https://github.com/polarismesh/polaris

[github-actions[bot]]

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[github-actions[bot]]

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[pemako]

@tokers the feat has been closed without any description, can this feature be supported? I really hope that this feat can be supported. Thank you very much. Looking forward to your reply.