feat: move native communication to FFI (#1457)

ui/flutter/ios/Runner/GopeedTaskEventForwarder.m

@@ -0,0 +1,35 @@
+#import "GopeedTaskEventForwarder.h"
+
+#import <Libgopeed/Libgopeed.h>
+
+@interface GopeedTaskEventForwarder () <LibgopeedTaskEventListener>
+
+@property(nonatomic, strong) FlutterMethodChannel *channel;
+
+@end
+
+@implementation GopeedTaskEventForwarder
+
+- (instancetype)initWithChannel:(FlutterMethodChannel *)channel {
+  self = [super init];
+  if (self) {
+    _channel = channel;
+  }
+  return self;
+}
+
+- (void)onTaskEvent:(NSString * _Nullable)payload {
+  NSString *arguments = payload ?: @"";
+  FlutterMethodChannel *channel = self.channel;
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [channel invokeMethod:@"taskEvent" arguments:arguments];
+  });
+}
+
+@end
+
+void GopeedSubscribeTaskEventsWithForwarder(
+    int64_t mask,
+    GopeedTaskEventForwarder * _Nullable listener) {
+  LibgopeedSubscribeTaskEvents(mask, listener);
+}