Binary search tree for Integer

1. Initialize binary search tree
2. Single/Bulk insertions
3. Single/Bulk deletions
4. Update binary search tree
5. Print binary search tree inorder
6. Print specific node in binary search tree inorder
7. Single/Bulk validate binary search tree

1. Introduce GenericBST to support multiple types
2. Introduce GenericNode to support multiple types
3. Introduce Evaluator
4. Added demo for binary search tree for String (initialize)

1. Implements insertions, deletions, validates and print for binary search tree for String
2. Fix bug for deletions

1. Add custom log for time elapsed for method call
2. Update to print binary search tree inorder
3. Support print preorder and postorder for binary search tree
4. Reduce unnecessary method call

1. Support update for binary search tree
2. Support single delete and validate binary search tree