implemented tier group names

[JoFrhwld]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (277a0b9) 90.47% compared to head (86ec68b) 90.64%.
Report is 2 commits behind head on dev.

Files	Patch %	Lines
src/aligned_textgrid/aligned_textgrid.py	80.00%	3 Missing ⚠️
src/aligned_textgrid/mixins/tiermixins.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #151      +/-   ##
==========================================
+ Coverage   90.47%   90.64%   +0.17%     
==========================================
  Files          14       14              
  Lines        1123     1165      +42     
==========================================
+ Hits         1016     1056      +40     
- Misses        107      109       +2     

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