Enhance memory management and data structures

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.

Misaki.HighPerformance.Test/Program.cs

@@ -1,7 +1,4 @@
-using Misaki.HighPerformance.Test;
-using Misaki.HighPerformance.Unsafe.Services;
+using BenchmarkDotNet.Running;
+using Misaki.HighPerformance.Test;
 
-AllocationManager.Initialize(512_000);
-var test = new CollectionBenchmark();
-test.UnsafeArray();
-AllocationManager.Dispose();
+BenchmarkRunner.Run<CollectionBenchmark>();