Move LINQ interfaces from collections to the LINQ chapter

[webmaster442]

#direction: right

[IEnumerable|
IEnumerator GetEnumerator ()] <:--

[IEnumerable<out T>|
IEnumerator<out T> GetEnumerator ()]

[IEnumerable<out T>] <:-- [IOrderedEnumerable<out TElement>|
CreateOrderedEnumerable<TKey>(
Func<out TElement,TKey> keySelector,
IComparer<TKey>? comparer, 
bool descending)]

[IEnumerable<out T>] <:-- [IGrouping<out TKey,out TElement>|
TKey Key { get\; }] <:-- [ILookup<TKey,TElement>|
int Count { get\; }
IEnumerable<TElement> this\[TKey key\] { get\; }|
bool Contains (TKey key)]

[IEnumerable<out T>] <:-- [IQueryable<out T>] <:-- [IOrderedQueryable<out T>]

[IEnumerable] <:-- [IQueryable] <:-- [IQueryable<out T>]

[IQueryable |
Type ElementType { get\; }
Expression Expression { get\; }
IQueryProvider Provider { get\; }]

[IEnumerator|
object Current { get\; }
bool MoveNext()
void Reset()]

[IEnumerator] <:-- [IEnumerator<out T>|
T Current { get\; }]

[IDisposable|
void Dispose()]

[IDisposable] <:-- [IEnumerator<out T>]