Add Tx.Tx accessor for the embedded *sql.Tx

[farhan687]

Name of feature:

Add Tx.Tx accessor for the embedded *sql.Tx

Pain or issue this feature alleviates:

Inventory needs to insert River jobs in the same transaction as a tag change, so a notification can't be lost if the process dies between the two. River's database/sql driver (riverdatabasesql) inserts jobs into a *sql.Tx, but sequel.Tx keeps its transaction private, so there's no way to hand it over.

• New func (t *Tx) Tx() *sql.Tx, returning the embedded *sql.Tx. It mirrors the existing DB.DB() accessor.

💔Thank you!

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