[PR] PushDownUtils should support not only FileScanBuilder but any SupportsPushDownCatalystFilters [spark]

["faucct (via GitHub)" <gi...@apache.org>]

faucct opened a new pull request, #45099:
URL: https://github.com/apache/spark/pull/45099

   ### What changes were proposed in this pull request?
   
   Making the usage more flexible by migrating it to a trait.
   
   ### Why are the changes needed?
   
   I want to implement a custom `ScanBuilder` supporting pushing predicates, but this code forces me to extend `FileScanBuilder`, though there is an interface exactly for that.
   
   ### Does this PR introduce _any_ user-facing change?
   
   I guess, not.
   
   ### How was this patch tested?
   
   Was not tested.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   No.
   


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