Backport to branch(3.8) : Revise ScalarDB design doc #2732

Job	Run time
Gradle check	3m 27s
Lint dockerfiles	44s
Cassandra 3.0 integration test	7m 3s
Cosmos DB integration test	27m 51s
Cassandra 3.11 integration test	6m 23s
DynamoDB integration test	11m 4s
MariaDB 10 integration test	3m 43s
MySQL 5.7 integration test	4m 8s
MySQL 8.0 integration test	6m 1s
MySQL 8.1 integration test	5m 30s
Oracle 18 integration test	8m 0s
Oracle 21 integration test	9m 29s
PostgreSQL 12 integration test	2m 36s
Oracle 23 integration test	10m 24s
PostgreSQL 13 integration test	2m 25s
PostgreSQL 14 integration test	2m 31s
PostgreSQL 15 integration test	2m 48s
SQL Server 2017 integration test	4m 9s
SQL Server 2019 integration test	4m 37s
SQL Server 2022 integration test	4m 46s
ScalarDB Server integration test	6m 51s
Multi-storage integration test	2m 53s
	2h 17m 23s

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