Add feeds_ex

Adding feeds_ex directly to the composer install allows us to automatically install a set of subdependencies that several websites consuming feeds require (specifically, https://github.com/SoftCreatR/JSONPath, https://github.com/jmespath/jmespath.php, and https://github.com/technosophos/querypath will be installed). The alternative to this would be to manually install individual libraries and updating the local installation of the feeds_ex module to import correctly.

The module is compatible with PHP 8.1 and Drupal >= 9.4.x