Added max_sum_bst.py (#11832)

* Added new algorithm

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* Update maximum_sum_bst.py

* def max_sum_bst(root: TreeNode | None) -> int:

* def solver(node: TreeNode | None) -> tuple[bool, int, int, int]:

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>