Add DDL for dropping sequence and auto_increment

[davidpiegza]

Description

This PR adds support to drop a sequence and auto_increment in VSchema in case it needs to be rolled back in a migration.

Drop a sequence

ALTER VSCHEMA DROP SEQUENCE test_seq

Drop auto_increment

ALTER VSCHEMA ON test_table DROP AUTO_INCREMENT

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[arthurschreiber]

One small suggestion - when dropping the auto increment I don't think we need to specify the sequence name?

This should be enough:

ALTER VSCHEMA ON test_table DROP AUTO_INCREMENT;

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