* Bump Rust edition to 2024
* gen is a reserved keyword now
* Remove ref mut on references
* Mark extern C as unsafe
* Wrap unsafe function bodies in unsafe block
* Geo hash implements Copy, don't reference but pass by value instead
* Replace secluded self import with parent
* Update execute_cluster_read_operation with new match semantics
* Fix lifetime issue
* Replace map_or with is_none_or
* set_var is unsafe now
* Reformat
* Rename InvertedIndex* -> InvertedIndexCompressed*
* Extract method VectorIndexEnum::fill_idf_statistics
* Extend VectorIndexEnum with new variants
* Introduce sparse::InvertedIndex::Version
* Replace SparseVectorIndexVersion -> InvertedIndex::Version
* Introduce sparse_vector_index::OpenArgs
* SparseVectorIndex::open: do not build index if directory is empty
Otherwise it would build the index twice since `SegmentBuilder::build()`
calls `::open()`, then `::build_index()`. This restores the old (<=v1.9)
behavior.
* Renames
