Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree.
Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1]
are both considered valid, but the path [1,2,4,3] is not valid. On the other hand, the path can be
in the child-Parent-child order, where not necessarily be parent-child order.
1 / \ 2 3
Explanation: The longest consecutive path is [1, 2] or [2, 1].
2 / \ 1 3
Explanation: The longest consecutive path is [1, 2, 3] or [3, 2, 1].
Note: All the values of tree nodes are in the range of [-1e7, 1e7].
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