openGemini: stateless SQL nodes, a metadata group and storage nodes

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openGemini architecture: writers such as Vector, Prometheus and Telegraf and readers such as Grafana connect through a load balancer to stateless ts-sql nodes; ts-sql reads the shard map from a three-node ts-meta Raft group and sends sub-plans to ts-store nodes, which keep a write-ahead log and LSM files on local disks.