Add Aurora DSQL as a new database dialect #971
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This PR adds Aurora DSQL as a new database dialect. We can't use the existing Postgres schema because DSQL doesn't support auto-incrementing IDs.
Also, the updated
InsertVersionSQL is prone to race conditions. Callers will need to guard this, or ensure migrations are applied as a singleton prior to application startup. The postgres lock will not work because DSQL doesn't support advisory locks. Long term, goose needs to support another form of locking via a dedicated lock table.Related to #962