feat(orm): add sequence getter for auto increment tables

[julienrbrt]

Description

Needed by #15304

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[aaronc]

Should it be called Current or Last sequence? Maybe it should be LastInsertedSequence?

[julienrbrt]

Should it be called Current or Last sequence? Maybe it should be LastInsertedSequence?

LastInsertedSequence does remove possible confusion yes, so I'll update to that 👍🏾