added GitHub CI for unit tests with PHP 8.2 and 8.3

[thbley]

related to #10026

• adds PHPUnit tests for PHP 8.0, 8.2 and 8.3 to GitHub Actions
• adds more callmap deltas for PHP 8.3 (alpha 3)
• adapts DateTimeTest for PHP 8.3
• adds PHPCS Code Style Analysis to GitHub Actions

[orklah]

Looks great!

We'll see if keeping the whole matrix is practical in terms of execution time in the long term

Can you look at the few error in Code Style Analysis and it should be good to go!

[thbley]

@weirdan all changes are in, could you check again?

[weirdan]

Can we perhaps split this into more manageable parts? E.g. callmap changes, then test changes and finally CI updates?

[thbley]

Can we perhaps split this into more manageable parts? E.g. callmap changes, then test changes and finally CI updates?

If you're up to the task, you can push a PR that updates our CI to work on 8.3, if it pass we'll be able to allow it in composer

As requested in #10026, there is only one PR. Once it's merged, I'm not seeing any reasons to reverting. Recreating multiple PRs is possible, but takes a lot of time, I'm not sure we need it here.

[orklah]

Thanks for doing this work :) It's great!