NativeEngine: Support Blob in createImageBitmap

[alexchuber]

This PR adds handling for a Blob object in createImageBitmap.

We should probably outright remove the Blob hack from here, but just to quickly & safely unblock these other changes, I hope this is alright.

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[sebavan]

LGTM but will let the native team comment on this

[bjsplat]

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