Add binary_coded_decimal.py (#10656)

* added decimal to bcd sequence

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* updated with fixes

* Update and rename bcd_sequence.py to binary_coded_decimal.py

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* Update binary_coded_decimal.py

* Update binary_coded_decimal.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>