feat: sqlserver / mssql support #1079

Job	Run time
Run tests with Yugabyte	4m 25s
Run tests with Yugabyte	4m 25s
Checks	1m 52s
Checks	1m 52s
Run test with H2	3m 5s
Run test with H2	3m 5s
Docs	1m 34s
Docs	1m 34s
Run test with Postgres	3m 48s
Run test with Postgres	3m 48s
Run test with Postgres and JSONB payload	1m 54s
Run test with Postgres and JSONB payload	1m 54s
Run test with SQL Server	4m 57s
Run test with SQL Server	3m 35s
	41m 48s

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