HPCC-10093 Read compressed file size from DFU attributes

In this fix, WsDFU DFUInfo/DFUQuery reads compressed file size from DFU attributes.
The compressed file size can be shown on EclWatch file browser and details page.

This fix also renames IsZipFile flag to IsCompressed.

Signed-off-by: Kevin Wang kevin.wang@lexisnexis.com