Added new algorithm to generate numbers in lexicographical order (#11674)

* Added algorithm to generate numbers in lexicographical order

* Removed the test cases

* Updated camelcase to snakecase

* Added doctest

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

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* Added descriptive name for n

* Reduced the number of letters

* Updated the return type

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

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* Updated import statement

* Updated return type to Iterator[int]

* removed parentheses

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