Create maths/pi_generator.py (#8666)

* Create pi_generator.py

* Update pi_generator.py

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* Update pi_generator.py

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

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* Update pi_generator.py

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

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* Update pi_generator.py

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

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* Update pi_generator.py

* Update pi_generator.py

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

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* Updated commentary on line 28, added math.pi comparison & math.isclose() test

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* Removed  # noqa: E501

* printf() added as recommended by cclaus

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