Implemented Suffix Tree Data Structure (#11554)

* Implemented KD-Tree Data Structure

* Implemented KD-Tree Data Structure. updated DIRECTORY.md.

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* Create __init__.py

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* Replaced legacy `np.random.rand` call with `np.random.Generator` in kd_tree/example_usage.py

* Replaced legacy `np.random.rand` call with `np.random.Generator` in kd_tree/hypercube_points.py

* added typehints and docstrings

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* docstring for search()

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* Added tests. Updated docstrings/typehints

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* updated tests and used | for type annotations

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* E501 for build_kdtree.py, hypercube_points.py, nearest_neighbour_search.py

* I001 for example_usage.py and test_kdtree.py

* I001 for example_usage.py and test_kdtree.py

* Update data_structures/kd_tree/build_kdtree.py

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

* Update data_structures/kd_tree/example/hypercube_points.py

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

* Update data_structures/kd_tree/example/hypercube_points.py

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

* Added new test cases requested in Review. Refactored the test_build_kdtree() to include various checks.

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* Considered ruff errors

* Considered ruff errors

* Apply suggestions from code review

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* Update kd_node.py

* imported annotations from __future__

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* Implementation of the suffix tree data structure

* Adding data to DIRECTORY.md

* Minor file renaming

* minor correction

* renaming in DIRECTORY.md

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* Considering ruff part-1

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* Considering ruff part-2

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* Considering ruff part-3

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* Considering ruff part-4

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* Considering ruff part-5

* Implemented Suffix Tree Data Structure.
Added some comments to my files in #11532, #11554.

* updating DIRECTORY.md

* Implemented Suffix Tree Data Structure.
Added some comments to my files in #11532, #11554.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: Ramy-Badr-Ahmed <Ramy-Badr-Ahmed@users.noreply.github.com>