fix(sql): mock transaction control commands: begin, commit, rollback

Summary

• fix(sql): mock transaction control commands: begin, commit, rollback

Now works with psycopg2 libraryexample_psycopg2.py

---

• Close sbroad#747 (closed)
• Cherry-pick to: none
• Docs follow-up: docs#415 (closed)
• Changelog is updated

changed milestone to %25.1 - Datamart

added domain/sql label

requested review from @EmirVildanov

assigned to @khamitov_e

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added domain/pgproto label

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Переименуй ещё префикс коммита из fix в feat, пожалуйста