COMPLETE CHANGELOG FROM v2:
* Add api for topic service
BREAKING CHANGES:
* deny any action in transaction after commit/rollback (switch to old behaviour with ydb.global_allow_split_transactions(True))
* raise exception for truncated response by default (switch to old behavior with ydb.global_allow_truncated_result(True))
* drop support python 2
* Use anonymous credentials for auth by default instead of iam metadata (use ydb.driver.credentials_from_env_variables for creds by env var)