ISTWCMS-4619: adding teaser component

source/_patterns/04-components/teaser/teaser.twig

+{% include '@components/card/card.twig' with {
+  'title': teaser.title,
+  'date': teaser.date,
+  'sources': teaser.image.sources,
+  'img_element': teaser.image.img_element,
+  'alt': teaser.image.alt,
+  'tags': teaser.tags,
+  'content': teaser.content,
+  'header_level': 2,
+  'show_hover': true,
+  'author': teaser.author,
+} %}
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