feat(mobile): platform image providers (#20927)

* platform image providers

* use key

* fix cache manager

* more logs, cancel on dispose instead

* split into separate files

* fix saving to cache

* cancel multi-stage provider

* refactored `getInitialImage`

* only wait for disposal for full images

* cached image works

* formatting

* lower asset viewer ram usage

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/utils/cache/custom_image_cache.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/painting.dart';
 import 'package:immich_mobile/presentation/widgets/images/local_image_provider.dart';
 import 'package:immich_mobile/presentation/widgets/images/remote_image_provider.dart';
+import 'package:immich_mobile/presentation/widgets/images/thumb_hash_provider.dart';
 import 'package:immich_mobile/providers/image/immich_local_image_provider.dart';
 import 'package:immich_mobile/providers/image/immich_local_thumbnail_provider.dart';
 import 'package:immich_mobile/providers/image/immich_remote_image_provider.dart';
@@ -9,6 +10,7 @@ import 'package:immich_mobile/providers/image/immich_remote_thumbnail_provider.d
 /// [ImageCache] that uses two caches for small and large images
 /// so that a single large image does not evict all small images
 final class CustomImageCache implements ImageCache {
+  final _thumbhash = ImageCache()..maximumSize = 0;
   final _small = ImageCache();
   final _large = ImageCache()..maximumSize = 5; // Maximum 5 images
 
@@ -39,13 +41,16 @@ final class CustomImageCache implements ImageCache {
   /// Gets the cache for the given key
   /// [_large] is used for [ImmichLocalImageProvider] and [ImmichRemoteImageProvider]
   /// [_small] is used for [ImmichLocalThumbnailProvider] and [ImmichRemoteThumbnailProvider]
-  ImageCache _cacheForKey(Object key) =>
-      (key is ImmichLocalImageProvider ||
-          key is ImmichRemoteImageProvider ||
-          key is LocalFullImageProvider ||
-          key is RemoteFullImageProvider)
-      ? _large
-      : _small;
+  ImageCache _cacheForKey(Object key) {
+    return switch (key) {
+      ImmichLocalImageProvider() ||
+      ImmichRemoteImageProvider() ||
+      LocalFullImageProvider() ||
+      RemoteFullImageProvider() => _large,
+      ThumbHashProvider() => _thumbhash,
+      _ => _small,
+    };
+  }
 
   @override
   bool containsKey(Object key) {