feat: return types are required in all new methods and functions #179
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What does this change?
This follows Drupal's latest coding standards/PHPStan changes to make return types required in all new methods and functions (see https://www.drupal.org/node/3461320). This applies to Core as well as contrib modules which run through the GitLab pipeline.
Since Drupal 9 it has been recommended to add return types, however it has not been enforced until now
I've updated the PHPStan baseline so this will only apply to new code. I'll create separate tickets for updating existing code.