OpenFileGDB: Better error message about cdf files

[jratike80]

What is the bug?

The OpenFileGDB driver cannot handle the CDF format (Compressed Data Format). The driver gives a message like

Warning 1: VA_Parcels layer has a Virginia_Parcel_Dataset_2024Q1.gdb\a00000009.gdbtable.cdf file whose format is unhandled

There may be other unsupported formats but I guess that the .cdf extension is a reliable sign about CDF and the error message could be explicit " ...layer has a file ... using Compressed Data Format (CDF) that is unhandled". Maybe even "...unhandled by the OpenFileGDB driver", because the FileGDB driver can handle CDF.

Steps to reproduce the issue

Run ogrinfo for a filegeodatabase having CDF compressed layers. For exaple the Virginia_Parcel_Dataset_2024Q1.gdb from https://vgin.maps.arcgis.com/home/item.html?id=29627d7c051a47dc8ce71b4484531ab3

Versions and provenance

Current and past GDAL versions on all platforms.

Additional context

No response