xDS configuration support to adapt the cloud native (k8s)

[zhangbo1882]

Is your feature request related to a problem? Please describe.
Now in cloud native world, we need a dynamic method to use API to configure the Load balancer.
Refer to https://www.envoyproxy.io/docs/envoy/latest/api-docs/xds_protocol

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[iyangsj]

目前并没有计划支持xDS接口（本身也未形成一种规范）。BFE在H2将开源控制台，支持使用方通过API修改配置。

[mileszhang2016]

Please refer to BFE API-Server
https://github.com/bfenetworks/api-server