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Implemented the DeleteFileIndex and Builder to manage and efficiently filter
delete files (equality deletes, position deletes, and deletion vectors)
based on sequence numbers and partitions.
Key changes:
DeleteFileIndexandDeleteFileIndex::Builderinsrc/iceberg/delete_file_index.{h,cc}.ContentFileUtilfor helper functions related to content files and DVs.ManifestReaderto support dropping stats viaTryDropStats().src/iceberg/test/delete_file_index_test.cc.