Do Storage Scanning thing from GraphD(as proxy or GW)

[wey-gu]

Background:

• It's a blessing that our design(computation and storage are separated), we could enable graph analytical data scanning to bypass the graphD interface.
• Yet it's a curse:
  • https://discuss.nebula-graph.com.cn/t/topic/9726/25
  • Running Nebula Algo/Spark Connector towards a K8s spawned NebulaGraph (https://github.com/vesoft-inc/nebula-cloud-platform/issues/141)

Discussion:

• could we consider adding the capability to proxy the connection of Meta/Storage RPC from GraphD(could be the same port or different) to mitigate the pain of connectivity to Meta/StorageD, especially in container/public cloud use cases?

[wey-gu]

cc @Nicole00 @HarrisChu @MuYiYong @veezhang @MegaByte875 @Jerry319609l