Implements of C5_6_BinaryTreeMatcher
Refine the implementation of Tree Questions:
1. C5_7_KValueNodePairSearch
2. C5_9_BuildTreeFromPairs
3. Add addAll and reset method to list
4. C5_10_BalancedTreeProver
Implement of Tree problems:
1. C5_11_MiniBinarySearchTree
2. C5_13_TreeByLayerList
3. C5_14_CommonAncestor
4. C5_16_SumTree