Need to fix dbapi implementation

[sashis]

tarantool.dbapi accidentally misses DataError from tarantool.error. it breaks the pep-249 support

[DifferentialOrange]

Thank you for the report!

Unfortunately, this is not the only thing that isn't yet compatible with PEP-249: see related tickets. We also do not have any plans to resolve them in the near future, so I can't promise that it will be done soon. DBAPI doesn't seem to be a top priority since synchronous Python connector is mostly used for prototypes or integrations tests.

PRs are always welcome.