Introduce ReversedRedisListView for Java 21 compatibility

[jxblum]

Builds Spring Data Redis on JDK 21 (EA).

[jxblum]

Seems the List interface and Deque interface in Java 21 have incompatible APIs in Java 21. Both interfaces defined reversed() method.

However, in the List interface, reversed() returns a List<E> and in Deque, reversed() returns a Deque<E>.

This means types like RedisList cannot implement both List and Deque.

[jxblum]

In addition, RedisList must also override and provide default implementations for the following List / Deque interface methods:

• addFirst(:E)
• addLast(:E)
• getFirst():E
• getLast():E
• removeFirst():E
• removeLast():E