Allow tuple-valued params in read_sql[_query]

[sh-at-cs]

• Closes read_sql_query should support tuples as params dict values #996
• Tests added: Kind of:
  • As explained in read_sql_query should support tuples as params dict values #996, the added types are not valid for SQLite databases/drivers, so it's not possible to add a test that actually executes without major changes to the CI setup. But I've added a skipped test instead so that at least the type checking part of the CI pipeline can check if the new annotations are at all sane.

[Dr-Irv]

You need to run black on your changed files, or follow the instructions at https://github.com/pandas-dev/pandas-stubs/blob/main/docs/setup.md to set up your environment and install the pre-commit checks.

[sh-at-cs]

Sorry, I ran my system black on it which had a different version and hence slightly different formatting. Should be fixed now - at least pre-commit runs without errors.

[Dr-Irv]

thanks @sh-at-cs