sql/ydb: added support for modify table migrations #16

Job	Run time
generate-cmp	41s
unit (1.22)	1m 9s
cli	2m 59s
integration	41s
lint	1m 10s
dialect-integration / integration-mysql57	2m 49s
dialect-integration / integration-maria107	2m 45s
dialect-integration / integration-maria103	2m 53s
dialect-integration / integration-postgres-ext-postgis	3m 17s
dialect-integration / integration-postgres12	3m 11s
dialect-integration / integration-maria102	2m 46s
dialect-integration / integration-mysql56	2m 44s
dialect-integration / integration-postgres14	3m 11s
dialect-integration / integration-postgres13	3m 2s
dialect-integration / integration-postgres11	3m 18s
dialect-integration / integration-cockroach	15s
dialect-integration / integration-postgres15	3m 6s
dialect-integration / integration-mysql8	2m 52s
dialect-integration / integration-tidb5	3m 28s
dialect-integration / integration-postgres10	3m 11s
dialect-integration / integration-sqlite	2m 22s
dialect-integration / integration-tidb6	3m 41s
	55m 31s

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