openGemini: one write and one query

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openGemini flow in six steps: a client posts line protocol to ts-sql; ts-sql asks ts-meta which shard owns the data; ts-sql forwards the point to the owning ts-store, which writes it to its write-ahead log and memory; a later InfluxQL query reaches ts-sql; ts-sql sends sub-plans to ts-store; and the partial results are merged into one result.