[IMP] web: add d-[device]-contents classes

This commit extends the `display` class with a new value to fine-tune
the layout in several circumstances. Classes added:
- 'd-[device]-contents'

task-2918464

X-original-commit: 1c871cc847f305649a4329b653540109596fa149
Part-of: odoo/odoo#101655

addons/web/static/src/scss/utilities_custom.scss

@@ -56,6 +56,12 @@ $utilities: () !default;
 $utilities: map-merge(
     $utilities,
     (
+        "display": map-merge(
+            map-get($utilities, "display"),
+            (
+                values: join(map-get(map-get($utilities, "display"), "values"), contents),
+            ),
+        ),
         "position": map-merge(
             map-get($utilities, "position"),
             (