feat(mobile): add support for encoded image requests in local/remote image APIs (#26584)

* feat(mobile): add support for encoded image requests in local and remote image APIs

* fix(mobile): handle memory cleanup for cancelled image requests

* refactor(mobile): simplify memory management and response handling for encoded image requests

* fix(mobile): correct formatting in cancellation check for image requests

* Apply suggestion from @mertalev

Co-authored-by: Mert <101130780+mertalev@users.noreply.github.com>

* refactor(mobile): rename 'encoded' parameter to 'preferEncoded' for clarity in image request APIs

* fix(mobile): ensure proper resource cleanup for cancelled image requests

* refactor(mobile): streamline codec handling by removing unnecessary descriptor disposal in loadCodec request

---------

Co-authored-by: Mert <101130780+mertalev@users.noreply.github.com>

mobile/lib/platform/local_image_api.g.dart

@@ -55,6 +55,7 @@ class LocalImageApi {
     required int width,
     required int height,
     required bool isVideo,
+    required bool preferEncoded,
   }) async {
     final String pigeonVar_channelName =
         'dev.flutter.pigeon.immich_mobile.LocalImageApi.requestImage$pigeonVar_messageChannelSuffix';
@@ -69,6 +70,7 @@ class LocalImageApi {
       width,
       height,
       isVideo,
+      preferEncoded,
     ]);
     final List<Object?>? pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
     if (pigeonVar_replyList == null) {