Update PHP requirement to 8.2+

- Update composer.json PHP requirement from 8.1 to 8.2
- Update CI workflows to test on PHP 8.2, 8.3, and 8.4
- Simplify PHPStan config by removing scanDirectories
- Remove tests/php.ini (CI handles extensions)

Codesniffer: case sensitive

Tests: redefine

Release v0.3

Release v0.2

Travis: fix tests