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### Description
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Added new external dialect for [openGauss](https://www.opengauss.org/en/).
### Checklist
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This pull request is:
- [x] A documentation / typographical error fix
- Good to go, no issue or tests are needed
- [ ] A short code fix
- please include the issue number, and create an issue if none exists, which
must include a complete example of the issue. one line code fixes without an
issue and demonstration will not be accepted.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests. one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
- please include the issue number, and create an issue if none exists, which must
include a complete example of how the feature would look.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests.
**Have a nice day!**
Closes: #8803
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/8803
Pull-request-sha:
ca5a7f1310b2ce93ce33618e0609abe23b41a3da
Change-Id: Ia8ca38f98f346fa3cc910ceb7af47f8c903eb587
(cherry picked from commit
db6145287244ca9801f7b7e1acc90cd25a572cde)
+------------------------------------------------+---------------------------------------+
| MonetDB [1]_ | sqlalchemy-monetdb_ |
+------------------------------------------------+---------------------------------------+
+| OpenGauss | openGauss-sqlalchemy_ |
++------------------------------------------------+---------------------------------------+
| SAP ASE (fork of former Sybase dialect) | sqlalchemy-sybase_ |
+------------------------------------------------+---------------------------------------+
| SAP Hana [1]_ | sqlalchemy-hana_ |
.. [1] Supports version 1.3.x only at the moment.
+.. _openGauss-sqlalchemy: https://gitee.com/opengauss/openGauss-sqlalchemy
.. _sqlalchemy-ingres: https://github.com/clach04/ingres_sa_dialect
.. _nzalchemy: https://pypi.org/project/nzalchemy/
.. _ibm-db-sa: https://pypi.org/project/ibm-db-sa/