sql/migrate: support lexing BEGIN TRY ... END CATCH #1930

Job	Run time
cli	3m 5s
generate-cmp	46s
lint	35s
integration	34s
unit (1.22)	26s
dialect-integration / integration-maria107	2m 51s
dialect-integration / integration-maria103	2m 51s
dialect-integration / integration-cockroach	2m 51s
dialect-integration / integration-maria102	2m 57s
dialect-integration / integration-mysql56	2m 48s
dialect-integration / integration-mysql57	2m 54s
dialect-integration / integration-mysql8	3m 10s
dialect-integration / integration-postgres10	3m 10s
dialect-integration / integration-postgres11	3m 8s
dialect-integration / integration-postgres12	3m 7s
dialect-integration / integration-postgres13	3m 10s
dialect-integration / integration-postgres14	3m 28s
dialect-integration / integration-postgres15	3m 12s
dialect-integration / integration-postgres-ext-postgis	3m 8s
dialect-integration / integration-sqlite	2m 30s
dialect-integration / integration-tidb5	3m 28s
dialect-integration / integration-tidb6	3m 11s
	57m 20s

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