Implemented doctests for geometry-related classes (#12368)

* Implemented doctests for geometry-related classes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Removed unused noqa directive

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* refactored sudoku_solver.py

* refactored sudoku_solver.py

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* context manager for file handling changed too in from_file function

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>