Add tabbed changeform support (#211).

* WIP : basic templates

* Add params

* Working override

* Use headerless version only during tabs

* Move CSS to separate file

* Extract js to static folder

* script is not self-closing

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* use classList for updating classes

* Add EOF (newline) to new text files

* a simple test to keep up code coverage

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fieldsets are not tabbed by default

* rename templatetag

* use default page if show_*_tabs are false

* Narrow down css to admin-interface

* Fix typo

* keep codacy happy

* prefix tab classes with tabbed-changeform-

* horizontal scrolling

* Update colors

* color updates

* add back missing font bold

Co-authored-by: vaz <vmohan@lenbox.io>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

admin_interface/migrations/0028_theme_show_fieldsets_as_tabs_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.1.3 on 2022-11-23 11:01
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("admin_interface", "0027_theme_list_filter_removal_links"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="theme",
+            name="show_fieldsets_as_tabs",
+            field=models.BooleanField(default=False, verbose_name="fieldsets as tabs"),
+        ),
+        migrations.AddField(
+            model_name="theme",
+            name="show_inlines_as_tabs",
+            field=models.BooleanField(default=True, verbose_name="inlines as tabs"),
+        ),
+    ]