Support specifying access method when creating Postgres tables

Support specifying access method when creating Postgres tables

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This pull request is:

- [ ] A documentation / typographical / small typing 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.
- [x] 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.

Fixes #10904

**Have a nice day!**

Closes: #10905
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/10905
Pull-request-sha: 85f232a303a5543725dac42206cb2395fc34109e

Change-Id: I5e2fc05a696eb6da71bbd695f0466e8552d203b6