Add sql server support #575

Job	Run time
integration (snowflake)	1m 59s
integration (bigquery)	2m 54s
integration (postgres)	1m 25s
single-run-different-versions (snowflake, 1_3_0)	1m 10s
single-run-different-versions (snowflake, 1_4_0)	1m 11s
single-run-different-versions (snowflake, 1_5_0)	1m 7s
single-run-different-versions (snowflake, 1_6_0)	1m 8s
single-run-different-versions (snowflake, 1_7_0)	1m 11s
single-run-different-versions (snowflake, 1_8_0)	1m 7s
single-run-different-versions (bigquery, 1_3_0)	1m 32s
single-run-different-versions (bigquery, 1_4_0)	1m 42s
single-run-different-versions (bigquery, 1_5_0)	1m 40s
single-run-different-versions (bigquery, 1_6_0)	1m 38s
single-run-different-versions (bigquery, 1_7_0)	1m 40s
single-run-different-versions (bigquery, 1_8_0)	1m 37s
single-run-different-versions (postgres, 1_3_0)	47s
single-run-different-versions (postgres, 1_4_0)	50s
single-run-different-versions (postgres, 1_5_0)	49s
single-run-different-versions (postgres, 1_6_0)	48s
single-run-different-versions (postgres, 1_7_0)	50s
single-run-different-versions (postgres, 1_8_0)	50s
	27m 55s

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