tcm structure change

[jasondet]

Before submitting a pull request, please make sure you've read and understood
pygama developer's
guide. In
particular, do not forget to:

• Update existing or add new tests
• Update existing or add new documentation
• Address any issue reported by GitHub bots

[codecov-commenter]

Codecov Report

Merging #322 (91fafe0) into main (16a3246) will decrease coverage by 0.16%.
The diff coverage is 13.55%.

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
- Coverage   33.10%   32.93%   -0.17%     
==========================================
  Files          73       73              
  Lines        6187     6242      +55     
==========================================
+ Hits         2048     2056       +8     
- Misses       4139     4186      +47     

Impacted Files	Coverage Δ
src/pygama/evt/build_tcm.py	0.00% <0.00%> (ø)
src/pygama/evt/tcm.py	0.00% <0.00%> (ø)
src/pygama/math/histogram.py	7.56% <0.00%> (ø)
src/pygama/math/utils.py	14.84% <0.00%> (-0.48%)	⬇️
src/pygama/lgdo/vectorofvectors.py	60.16% <16.32%> (-29.03%)	⬇️

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[jasondet]

The build_documentation failure is a sphinx bug as reported in earlier PRs, merging...