DEV: Remove lazy-yt and replace with lazy-videos (#20722)

- Refactors the old plugin to remove jquery usage
- Adds support for Vimeo videos (default on) and Tiktok (experimental and default off)

plugins/discourse-lazy-videos/config/locales/server.en.yml

@@ -0,0 +1,3 @@
+en:
+  site_settings:
+    lazy_videos_enabled: "Enable the Lazy Videos plugin"

plugins/discourse-lazy-videos/config/settings.yml

@@ -0,0 +1,17 @@
+plugins:
+  lazy_videos_enabled:
+    default: true
+    client: true
+    hidden: true
+  lazy_youtube_enabled:
+    default: true
+    client: true
+    hidden: false
+  lazy_vimeo_enabled:
+    default: true
+    client: true
+    hidden: false
+  lazy_tiktok_enabled:
+    default: false
+    client: true
+    hidden: false