Move UI functionality out into eca_ui submodule
>>> [!note] Migrated issue
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Reported by: [jurgenhaas](https://www.drupal.org/user/168924)
Related to !139
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>ECA in productions works perfectly fine without a modeller already. But it still comes with a few UI functions like the model list, the import function and so on. All of which is not required and should be moved out into eca_ui, just like views_ui and field_ui does it as well.</p>
<p>This was first brought up in <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/eca/-/work_items/3275457" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/eca/-/work_items/3275457</a></span> and the question was if this should still be done for the 1.0 release. I do think that's important and the impact should be minimal.</p>
> Related issue: [Issue #3275457](https://www.drupal.org/node/3275457)
> Related issue: [Issue #3238206](https://www.drupal.org/node/3238206)
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