This reverts commit b12bdd0e as it
breaks existing tests that expect image loaded after certaing number of
pupms. With image loading done on separate isolate pumping is not
guaranteed to get image loaded.

* Use separate isolate for image loading. Use TransferableTypedData to const-cost receive bytes from that isolate.

Using custom exception class for network loading error

* add web and io implemenations of network and asset image

* fix foundation import

* update to remove extra asset image indirection

* skip chunk test

* address comments

* disable non-functional test

* disable all golden tests

* address comments