Refactors column and matrix access to use unified `BitSliceView` and `IntSliceView` abstractions, replacing legacy `PackedCol`/`IntColView` types. Introduces `BitSlice`/`IntSlice` traits for zero-copy, trait-based bitwise and arithmetic operations across persistent and temporary vector types. Removes deprecated in-memory `MemoryBitVec` and `MemoryIntVec` implementations and their tests, while updating dependent crates to use the new view-based API and `BitSliceMut` trait.
Eric Coissac
f91c5a3f79