Improve Enumerable.Skip and Enumerable.Take performance (#112401)

* improve Enumerable.Skip and Enumerable.Take performance

* use TryGetSpan

* use TryGetSpan at IndexOf in IListSkipTakeIterator

Author: miyaji255

src/libraries/System.Linq/src/System/Linq/SkipTake.SpeedOpt.cs

@@ -148,6 +148,12 @@ public void CopyTo(TSource[] array, int arrayIndex) =>
 
             private static void Fill(IList<TSource> source, Span<TSource> destination, int sourceIndex)
             {
+                if (source.TryGetSpan(out ReadOnlySpan<TSource> sourceSpan))
+                {
+                    sourceSpan.Slice(sourceIndex, destination.Length).CopyTo(destination);
+                    return;
+                }
+
                 for (int i = 0; i < destination.Length; i++, sourceIndex++)
                 {
                     destination[i] = source[sourceIndex];
@@ -160,6 +166,11 @@ public int IndexOf(TSource item)
             {
                 IList<TSource> source = _source;
 
+                if (source.TryGetSpan(out ReadOnlySpan<TSource> span))
+                {
+                    return span.Slice(_minIndexInclusive, Count).IndexOf(item);
+                }
+
                 int end = _minIndexInclusive + Count;
                 for (int i = _minIndexInclusive; i < end; i++)
                 {