Remove support for by_type split files

[maxnoe]

No description provided.

[codecov]

Codecov Report

Merging #2032 (2a2fb41) into master (a10e93a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2032   +/-   ##
=======================================
  Coverage   92.36%   92.37%           
=======================================
  Files         193      193           
  Lines       15834    15762   -72     
=======================================
- Hits        14625    14560   -65     
+ Misses       1209     1202    -7     

Impacted Files	Coverage Δ
ctapipe/conftest.py	95.40% <ø> (+0.50%)	⬆️
ctapipe/io/datawriter.py	89.96% <100.00%> (-0.14%)	⬇️
ctapipe/io/tableloader.py	98.35% <100.00%> (+1.77%)	⬆️
ctapipe/io/tests/test_table_loader.py	99.42% <100.00%> (-0.08%)	⬇️

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[kosack]

I had forgot this wasn't already done!