chore: sync php-ext submodule: refactor: restructure debian files under module subdirectories (#12)

- Move sqlsrv, pdo_sqlsrv, runkit7 control.in files into their respective module directories
- Add module-specific rules files (sqlsrv/rules, pdo_sqlsrv/rules) with dh_shlibdeps override
- Add runkit7 configuration files (php.ini, source) for GitHub-based source download
- Add debian/compat file for debhelper compatibility

Co-authored-by: AI Assistant <ai@diepxuan.com>

Author: caothu159