Add decoding support for TXTR

[henriquegemignani]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.25478% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.13%. Comparing base (c0e99cc) to head (1ead371).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/retro_data_structures/formats/txtr.py	80.25%	17 Missing and 14 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   69.83%   70.13%   +0.29%     
==========================================
  Files          88       88              
  Lines        5653     5810     +157     
  Branches      775      802      +27     
==========================================
+ Hits         3948     4075     +127     
- Misses       1574     1590      +16     
- Partials      131      145      +14     

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