Simplify and optimize the command response future/promise flow #1179

Job	Run time
CI (ubuntu-latest, 11, DB2-11.5) / Run tests	16m 45s
CI (ubuntu-latest, 11, MSSQL-2017-latest) / Run tests	1m 22s
CI (ubuntu-latest, 11, MariaDB-10.4) / Run tests	2m 21s
CI (ubuntu-latest, 11, MSSQL-2019-latest) / Run tests	1m 21s
CI (ubuntu-latest, 11, MySQL-5.7) / Run tests	2m 7s
CI (ubuntu-latest, 11, MySQL-5.6) / Run tests	2m 18s
CI (ubuntu-latest, 11, MySQL-8.0) / Run tests	1m 52s
CI (ubuntu-latest, 11, PostgreSQL-10) / Run tests	3m 45s
CI (ubuntu-latest, 11, PostgreSQL-11) / Run tests	3m 57s
CI (ubuntu-latest, 11, PostgreSQL-9) / Run tests	3m 48s
CI (ubuntu-latest, 21, MariaDB-10.4) / Run tests	2m 5s
CI (ubuntu-latest, 11, SQL-templates) / Run tests	5m 48s
CI (ubuntu-latest, 21, MSSQL-2019-latest) / Run tests	1m 20s
CI (ubuntu-latest, 21, MySQL-5.7) / Run tests	2m 10s
CI (ubuntu-latest, 21, Oracle-23) / Run tests	1m 46s
CI (ubuntu-latest, 21, PostgreSQL-11) / Run tests	3m 52s
Deploy to OSSRH	0s
	56m 37s

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