Add LZ77 compression algorithm (#8059)

* - add "lz77_compressor" class with compress and decompress methods using LZ77 compression algorithm

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* - use "list" instead "List", formatting

* - fix spelling

* - add Python type hints

* - add 'Token' class to represent triplet (offset, length, indicator)

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* - add test, hange type rom List to list

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* - remove extra import

* - remove extra types in comments

* - better test

* - edit comments

* - add return types

* - add tests for __str__ and __repr__

* Update lz77.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>