public CodecInteraction moveToLastElement(final Token token)
            {
                return moveToLastElementInteractions.computeIfAbsent(
                    token, (t) -> new MoveToLastElement(groupPathsByField.get(t), t));
            }
Find or create a {@link CodecInteraction} to represent moving to the last
element in a repeating group.

<p>For encoders, decoders, and codecs, this will be when the last element
is accessed, e.g., {@code myGroup.next()} when {@code myGroup.count - myGroup.index == 1}.

@param token the token identifying the group
@return the {@link CodecInteraction} instance
sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/common/FieldPrecedenceModel.java