Improve memory safety and alignment handling

- Updated `.gitignore` to include `.vscode/` and clarified comments.
- Introduced `SafeHandle` for managing memory alignment and safe access.
- Refactored `UnsafeArray<T>` to add bounds checking and alignment logic.
- Added `IUnsafeHashCollection<T>` for specialized hash-based collections.
- Refactored `UnsafeHashMap<TKey, TValue>` and `UnsafeHashSet<T>` to use `HashMapHelper<TKey>` with alignment support.
- Made `UnsafeSlotMap<T>` methods `readonly` for immutability.
- Enhanced `HashMapHelper<TKey>` with alignment-aware buffer management and validation.
- Updated benchmarks to use `UnsafeArray<Vector256<int>>` and added capacity checks.
- Incremented assembly version to `1.1.3` in `Misaki.HighPerformance.LowLevel.csproj`.
- Updated `Program.cs` to run `CollectionBenchmark` and demonstrate safe disposal handling.

Misaki.HighPerformance.LowLevel/Collections/Contracts/IUnsafeCollection.cs

@@ -24,7 +24,7 @@ public unsafe interface IUnsafeCollection : IDisposable
     void* GetUnsafePtr();
 }
 
-public unsafe interface IUnsafeCollection<T> : IUnsafeCollection, IEnumerable<T>
+public interface IUnsafeCollection<T> : IUnsafeCollection, IEnumerable<T>
     where T : unmanaged
 {
     /// <summary>
@@ -44,7 +44,40 @@ public unsafe interface IUnsafeCollection<T> : IUnsafeCollection, IEnumerable<T>
     void Resize(int newSize, AllocationOption option);
 }
 
-public unsafe interface IUnTypedCollection : IUnsafeCollection
+public interface IUnsafeHashCollection<T> : IEnumerable<T>, IDisposable
+    where T : unmanaged
+{
+    /// <summary>
+    /// Indicates whether the object has been created. Returns true if the object is created, otherwise false.
+    /// </summary>
+    bool IsCreated
+    {
+        get;
+    }
+
+    /// <summary>
+    /// Gets the number of elements in a collection. The value is read-only.
+    /// </summary>
+    int Count
+    {
+        get;
+    }
+
+    /// <summary>
+    /// Removes all elements from the collection. The collection will be empty after this operation.
+    /// </summary>
+    void Clear();
+
+    /// <summary>
+    /// Changes the size of a collection to the specified value.
+    /// </summary>
+    /// <remarks>This is to adjust the element count of the collection, not the size of the underlying buffer in memory.</remarks>
+    /// <param name="newSize">Specifies the new size to which the collection should be adjusted.</param>
+    /// <param name="option">Specifies allocation options that may affect how memory is managed during the resize operation.</param>
+    void Resize(int newSize, AllocationOption option);
+}
+
+public interface IUnTypedCollection : IUnsafeCollection
 {
     /// <summary>
     /// The total size of the buffer in bytes.