add algorithm to check binary search tree (#7947)

* add algorithm to check binary search tree

* add tests

* add leetcode link

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* fix typehints

* typehints fixes

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* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

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* fix flake8

* fix typehint

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* add TreeNode resolving

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* change func name

* Update data_structures/binary_tree/is_bst.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* review notes fixes.

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* fix flake8

* fix flake 8

* fix doctest

* Update data_structures/binary_tree/is_bst.py

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Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>
Co-authored-by: Christian Clauss <cclauss@me.com>