Add Postgres support with tests

[neverything]

tl;dr Adds more tests and changes some tests to cover Postgres support. Explicit orderBy('type') for Tag::getTypes()

Note

The package does already work with Postgres. I must have either used a very old version or had something else wrong in my custom queries. See discussion here: #532

Changes in this PR:

• Add MySQL 8, PgSQL 16 and PgSQL 17 to the run-tests workflow
• Change scripts in composer.json to allow running tests for mysql and pgsql drivers
• Changes tests that return TestModel (the one using HasTags) from toEqual() to toContain(), because the returned sorting in pgsql is different
• Adds more tests for the tag order_column
• Adds more tests to check withAnyTags and withAllTags that work with both name and slug of the tags
• ⚠️ (only change in package) adds explicit orderBy('type') to Tag::getTypes() to satisfy the different order in pgsql

If the order from Tag::getTypes() doesn't matter, we could remove this change and alter the test in https://github.com/spatie/laravel-tags/blob/main/tests/TagTest.php#L175-L186 to not expect an explicit order.

Happy to make changes if needed.

[freekmurze]

The package does already work with Postgres.

Should we still review this PR, or should it be closed?

[neverything]

The package does already work with Postgres.

Should we still review this PR, or should it be closed?

@freekmurze only if you want to expand the tests to be run on MySQL 8, PgSQL 16 & 17 too imho. To me, it's fine either way.

[freekmurze]

Always nice to have more tests, and it all looks good. Thank you!