Updated `CollectionBenchmark` for setup/cleanup methods,
streamlined benchmarking in `Program.cs`, and improved
documentation in `AllocationOption` and `Allocator` enums.
Made `Enumerator` structs public in several collections
and clarified constructor parameters. Introduced a new
`UnsafeStack` struct for stack operations. Enhanced
`AllocationManager` with better memory tracking and
management, ensuring proper allocation and disposal.
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