feat(mobile): native clients (#21459)

* platform clients

* uppercase http method

* fix hot reload

* custom user agent

* init before app launch

* set defaults

* move to bootstrap

* unrelated change

* disable disk cache by default

* optimized decoding

* remove incremental

* android impl

* memory optimization

* lock approach is slower on ios

* conditional cronet

* clarify parameter

* enable disk cache

* set user agent

* flutter-side decode

* optimized http

* fixed locking

* refactor

* potential race conditions

* embedded cronet

* refactor, fix capacity handling

* fast path for known content length

* ios optimizations

* re-enable cache

* formatting

* bump concurrency

* clear cache button

* fix eviction race condition

* add extra cancellation check

* tighten dispose

* better error handling

* fix disposal

---------

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

mobile/pigeon/remote_image_api.dart

@@ -0,0 +1,28 @@
+import 'package:pigeon/pigeon.dart';
+
+@ConfigurePigeon(
+  PigeonOptions(
+    dartOut: 'lib/platform/remote_image_api.g.dart',
+    swiftOut: 'ios/Runner/Images/RemoteImages.g.swift',
+    swiftOptions: SwiftOptions(includeErrorClass: false),
+    kotlinOut:
+        'android/app/src/main/kotlin/app/alextran/immich/images/RemoteImages.g.kt',
+    kotlinOptions: KotlinOptions(package: 'app.alextran.immich.images', includeErrorClass: false),
+    dartOptions: DartOptions(),
+    dartPackageName: 'immich_mobile',
+  ),
+)
+@HostApi()
+abstract class RemoteImageApi {
+  @async
+  Map<String, int>? requestImage(
+    String url, {
+    required Map<String, String> headers,
+    required int requestId,
+  });
+
+  void cancelRequest(int requestId);
+
+  @async
+  int clearCache();
+}