Refactor unsafe collections and improve memory handling

Refactored enumerators across multiple unsafe collections to use
`ref` returns for `Current`, improving performance and reducing
memory usage. Enhanced memory management with `AllocationOption`
support and optimized resizing logic for collections like
`UnsafeBitSet`, `UnsafeSlotMap`, and `UnsafeSparseSet`.

Updated `publish-nuget.yaml` to support manual workflow dispatch
and trigger on `push`/`pull_request` events. Incremented project
version to `1.1.2` and ensured NuGet package generation on build.

Misaki.HighPerformance.LowLevel/Collections/UnsafeHashSet.cs

@@ -19,19 +19,14 @@ public unsafe struct UnsafeHashSet<T> : IUnsafeCollection<T>, IEnumerable<T>
     {
         internal HashMapHelper<T>.Enumerator _enumerator;
 
+        public readonly T Current  => _enumerator.buffer->_keys[_enumerator.index];
+        readonly object IEnumerator.Current => Current;
+
         public Enumerator(HashMapHelper<T>* hashMap)
         {
             _enumerator = new HashMapHelper<T>.Enumerator(hashMap);
         }
 
-        public T Current
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _enumerator.buffer->_keys[_enumerator.index];
-        }
-
-        object IEnumerator.Current => Current;
-
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool MoveNext() => _enumerator.MoveNext();