[w3c/FileAPI] Reslove Blob to an existing ArrayBuffer (#143)

Currently, Blobs can only be resloved with a newly-created ArrayBuffer.

Sometimes, it would be much more efficient if a Blob can be directly resolved to an existing ArrayBuffer(If the size of ArrayBuffer is sufficient). For example, a content of a very large file can be directly read to the ArrayBuffer of a WASM memory. Without this feature, we need to first call File.ArrayBuffer to resolve the large content to a newly-created ArrayBuffer, and then copy it to the WASM memory.

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https://github.com/w3c/FileAPI/issues/143