Replace custom MultiImageStreamCompleter with flutter/foundation/MultiFrameImageStreamCompleter

[lwj1994]

on 3.19，it will lead some ios crash

fix flutter/flutter#148927

There is no need to use Stram, as it will only fire once.

when result is FileInfo, it means download success.

      await for (final result in stream) {
        if (result is DownloadProgress) {
          chunkEvents.add(
            ImageChunkEvent(
              cumulativeBytesLoaded: result.downloaded,
              expectedTotalBytes: result.totalSize,
            ),
          );
        }
        if (result is FileInfo) {
          final file = result.file;
          final bytes = await file.readAsBytes();
          final decoded = await decode(bytes);
          yield decoded;
        }
      }

[martijn00]

@lwj1994 Can you provide more info on this and rebase and fix issues?

[lwj1994]

Can you provide more info on this and rebase and fix issues?

@martijn00 hi.
The basic information is as described above. I received feedback from online users about the app crashing. The app crashes after scrolling for a while in a dual-column image list. This branch has been live for a month now and has been stable with no crash until now.