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issue: https://github.com/milvus-io/milvus/issues/36182 * improved `Column.h` to make the code much more readable and maintainable, and added detailed comments. * fixed an issue where `ArrayColumn::NumRows()` always returns 0 when the mmap backing storage is a file. * removed unused `ColumnBase` constructors and unnecessary members so we don't get confused. * Updated `test_chunk_cache.cpp` to make the tests parameterized: to test both mmap enabled and disabled. Added sparse field in the test to add coverage. * re-enabled test `Sealed::GetSparseVectorFromChunkCache`. * But 2 other disabled tests `Sealed::WarmupChunkCache` and `Sealed::GetVectorFromChunkCache` remain disabled, there seems to be errors. @bigsheeper PTAL. --------- Signed-off-by: Buqian Zheng <zhengbuqian@gmail.com>