Implement image previewing

I have tested this with png and jpeg/jpg which both work but most other image types should work as well.
![image](/attachments/25318577-d48c-4902-93b3-9adbb8b954e7)

Co-authored-by: Jan Klattenhoff <j.klattenhoff@neusta.de>
Reviewed-on: sites/file-explorer#12
Co-authored-by: jank1619 <jan@kjan.email>
Co-committed-by: jank1619 <jan@kjan.email>

composer.json

@@ -15,6 +15,7 @@
         "symfony/flex": "^2",
         "symfony/form": "^7.1",
         "symfony/framework-bundle": "7.1.*",
+        "symfony/mime": "7.1.*",
         "symfony/runtime": "7.1.*",
         "symfony/stimulus-bundle": "^2.22",
         "symfony/twig-bundle": "7.1.*",
@@ -22,7 +23,8 @@
         "symfony/yaml": "7.1.*",
         "symfonycasts/tailwind-bundle": "^0.6.1",
         "twig/extra-bundle": "^2.12|^3.0",
-        "twig/twig": "^2.12|^3.0"
+        "twig/twig": "^2.12|^3.0",
+        "ext-fileinfo": "*"
     },
     "config": {
         "allow-plugins": {