Adding to_ctc function

[JoOkuma]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.29412% with 5 lines in your changes missing coverage. Please review.

Project coverage is 88.44%. Comparing base (975ba0b) to head (d694239).

Files with missing lines	Patch %	Lines
src/tracksdata/io/_ctc.py	78.26%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   88.49%   88.44%   -0.06%     
==========================================
  Files          43       43              
  Lines        2391     2414      +23     
  Branches      406      409       +3     
==========================================
+ Hits         2116     2135      +19     
- Misses        163      165       +2     
- Partials      112      114       +2     

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