compress: fix crash on ranged reads when gzip metadata is corrupted

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Gzip metadata is read from the wrapped remote and could contain an
invalid block size or incomplete block index. A range read could then
panic in the seekable gzip reader.

Validate the gzip sidecar invariants before constructing a reader so
malformed remote metadata returns an error instead of crashing rclone.

(cherry picked from commit c8d60a67fc)

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