Issue #3347672: Create new SDC component for Umami (card view mode)

core/profiles/demo_umami/themes/umami/components/card/card.component.yml

+# This is so your IDE knows about the syntax for fixes and autocomplete.
+$schema: https://git.drupalcode.org/project/drupal/-/raw/10.1.x/core/modules/sdc/src/metadata.schema.json
+
+# The human readable name.
+name: Card
+
+# Status can be: "experimental", "stable", "deprecated", "obsolete".
+status: experimental
+
+# Schema for the props. We support www.json-schema.org. Learn more about the
+# syntax there.
+props:
+  type: object
+  properties:
+    attributes:
+      type: Drupal\Core\Template\Attribute
+      title: Attributes
+      description: Wrapper attributes.
+    html_tag:
+      type: string
+      title: HTML tag for wrapper
+
+      # Limit the available options by using enums.
+      enum:
+        - article
+        - div
+      # Provide a default value
+      default: article
+
+# Slots always hold arbitrary markup. We know that beforehand, so no need for
+# a schema for slots.
+slots:
+  # The key is the name of the slot. In your template you will use
+  # {% block content %}.
+  content:
+    title: Content
+    required: true
+    description: The card content.