Make HasItems in Extensions Consistent

[RealDotNetDave]

Ensure that the collection Extensions classes have consistent HasItems methods. They should be like this:

[MethodImpl(MethodImplOptions.NoInlining)]

public static bool HasItems<T>([NotNull] this List<T> list, [NotNull] Predicate<T> action)
{
	return list.TrueForAll(action);
}
		
		
public static bool HasItems([NotNull] this IEnumerable list) => list.Count() > 0;
		
public static bool HasItems([NotNull] this IEnumerable list, int count) => list.Count() == count;

Add to:

1. ArrayExtensions *+
2. CollectionExtensions *+
3. DictionaryExtensions *+
4. EnumerableExtensions *+
5. ImmutableArrayExtensions *+
6. ObservableCollectionExtensions *+
7. ReadOnlyCollectionExtensions *+
8. SortedDictionaryExtensions *+
9. SortedSetExtensions *+