v3.69.0

• Added experimental method for execute query and read only one row from result:
  • query/Client.ReadRow
  • query/Session.ReadRow
  • query/Transaction.ReadRow
• Added experimental method for execute query and read only one result set from result:
  • query/Client.ReadResultSet
  • query/Session.ReadResultSet
  • query/Transaction.ReadResultSet
• Added experimental sugar.UnmarshallRow[T] and sugar.UnmarshallResultSet[T] helpers for converts YDB rows to typed objects

Full Changelog: v3.68.1...v3.69.0