Rename argument/provides handlers to input/outputs
>>> [!note] Migrated issue
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<!-- Migrated from issue #3540064. -->
Reported by: [michaellander](https://www.drupal.org/user/636494)
Related to !3
>>>
<p>Everywhere we are using the terminology 'Argument' or 'Provides, we should rename to 'Input' and 'Output' subsequently. </p>
issue