Add create to Storage that takes an InputStream

Storage class now has a method to create an object:

create(BlobInfo blobInfo, final byte[] content, BlobTargetOption... options)

I know that we already provide a BlobWriteChannel but it might be useful to also have:

create(BlobInfo blobInfo, InputStream content, BlobTargetOption... options)

for uploading small files without reading their bytes. Thoughts?

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