Add Content Size information exposition to LZ4FrameInputStream #144
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This PR to allow users to retrieve Content Size information before uncompressing file.
This is especially usefully when working with AWS S3 filesystem.
Because of the S3 streaming API limitation that requires the file size before starting to write it, access to Content Size a priori is mandatory to avoid loading the file in memory.
As workaround we are currently forced to directly read the Content Size header bytes from the lz4 file byte array.