Create vernam_cipher.py (#10702)

* Create vernam_cipher.py

added vernam cipher

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* Update vernam_cipher.py

added return type

* Update vernam_cipher.py

added type hint for plaintext and key

* Update vernam_cipher.py

added tests

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* Update vernam_cipher.py

Added tests

* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

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* Update vernam_cipher.py

* Update ciphers/vernam_cipher.py

* Update vernam_cipher.py

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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 <cclauss@me.com>