Introduce htmx in sith files

* Convert FileModerationView into ListView and add pagination with htmx
* Don't allow sas moderation in file moderation view
* Split up base.jinja and introduce base_fragment.jinja
* Improve FileModerationView performances and make it root only
* Add permissions tests for file modération

core/templates/core/base_fragment.jinja

@@ -0,0 +1,20 @@
+{% block additional_css %}{% endblock %}
+{% block additional_js %}{% endblock %}
+
+<div id="fragment-content">
+  {% block tabs %}
+    {% include "core/base/tabs.jinja" %}
+  {% endblock %}
+
+  {% block errors%}
+    {% if error %}
+      {{ error }}
+    {% endif %}
+  {% endblock %}
+
+  {% block content %}
+  {% endblock %}
+</div>
+
+{% block script %}
+{% endblock %}