Feature Request: MoveTables support for auto replacing auto_inc cols with sequences

[mattlord]

Feature Description

Since #15679 we automatically strip any MySQL auto_increment clauses on tables that are being moved (using the MoveTables command) from an unsharded keyspace to a sharded one. And since #13656 we support initializing any sequences in the target keyspace on SwitchTraffic.

It would be really nice if we also supported automatically replacing those MySQL auto_increment clauses with Vitess sequences. This would eliminate a fair amount of toil and potential for mistakes.

Use Case(s)

Moving tables from an unsharded to a sharded keyspace, which is common e.g. when initialing migrating into Vitess. And one initial hurdle is moving from MySQL managed auto_increment values in the MySQL schema to Vitess managed AutoIncrement values in the Vitess vschema.

[arthurschreiber]

Yes, this would be really really great.