feat: add Umami Analytics integration and widget (#5362)

Co-authored-by: Josh G <febrile42@users.noreply.github.com>
Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>
Co-authored-by: Thomas <thomas@ajnart.fr>

packages/definitions/src/widget.ts

@@ -37,5 +37,6 @@ export const widgetKinds = [
   "immich-albumCarousel",
   "tracearr",
   "speedtestTracker",
+  "umami",
 ] as const;
 export type WidgetKind = (typeof widgetKinds)[number];