Nick Craig-Wood ab803d1278 b2: implement OpenChunkWriter and multi-thread uploads #7056
This implements the OpenChunkWriter interface for b2 which
enables multi-thread uploads.

This makes the memory controls of the s3 backend inoperative; they are
replaced with the global ones.

    --b2-memory-pool-flush-time
    --b2-memory-pool-use-mmap

By using the buffered reader this fixes excessive memory use when
uploading large files as it will share memory pages between all
readers.
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