C++ beam search and edit distance

[borgholt]

Description

• C++ implementation of beam search and edit distance
• Refactorization to more functional interface
• Fixed lexicon path bug

[codecov]

Codecov Report

❌ Patch coverage is 92.10526% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.38%. Comparing base (4de4067) to head (adb3f61).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/error_align/beam_search.py	92.93%	4 Missing and 9 partials ⚠️
src/error_align/path_to_alignment.py	84.21%	4 Missing and 2 partials ⚠️
src/error_align/error_align.py	94.02%	1 Missing and 3 partials ⚠️
src/error_align/utils.py	85.71%	1 Missing and 3 partials ⚠️
src/error_align/core.py	76.92%	3 Missing ⚠️
src/error_align/backtrace_graph.py	92.59%	0 Missing and 2 partials ⚠️
src/error_align/graph_metadata.py	98.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   94.89%   93.38%   -1.51%     
==========================================
  Files           6        9       +3     
  Lines         548      635      +87     
  Branches       90      102      +12     
==========================================
+ Hits          520      593      +73     
- Misses         10       15       +5     
- Partials       18       27       +9     

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