C++ Tokenizer implementation

[OlivierBinette]

Check if release PR fulfills these requirements

• Changelog has been updated and breaking changes have been marked (if any).
• Tests have been added if necessary.

Type of change

• Breaking changes.
• Backward compatible feature additions.
• Backward compatible bug fixes.

Additional comments and description of changes

[codecov-commenter]

Codecov Report

Merging #26 (0167206) into dev (7b9c58b) will decrease coverage by 4.26%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##              dev      #26      +/-   ##
==========================================
- Coverage   81.31%   77.04%   -4.27%     
==========================================
  Files          15       15              
  Lines         305      305              
==========================================
- Hits          248      235      -13     
- Misses         57       70      +13     

Flag	Coverage Δ
unittests	77.04% <50.00%> (-4.27%)	⬇️

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Impacted Files	Coverage Δ
stringcompare/distance/__init__.py	100.00% <ø> (ø)
stringcompare/preprocessing/tokenizer.py	0.00% <0.00%> (-61.91%)	⬇️
stringcompare/preprocessing/__init__.py	100.00% <100.00%> (ø)

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