docker cp: report both content size and transferred size
When copying files with `docker cp`, the success message now shows both
the actual content size and the transferred (tar stream) size when they
differ, making it easier to understand compression and overhead:
Successfully copied 2.01MB (transferred 2.53MB) to ctr:/dir
Extract copySummary helper to keep copyToContainer under the gocyclo
complexity threshold. Add unit tests for copySummary and stdin path.
Signed-off-by: 4RH1T3CT0R7 <iprintercanon@gmail.com>
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