Refactor using cohesion-tools package

[nobu-g]

What

I've separated cohesion-analysis-related codes into another package called cohesion-tools.
This PR reflects the change above.

[codecov]

Codecov Report

Merging #186 (f8c5945) into dev (c8a302b) will increase coverage by 0.17%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##              dev     #186      +/-   ##
==========================================
+ Coverage   90.54%   90.71%   +0.17%     
==========================================
  Files          63       62       -1     
  Lines        5352     4891     -461     
==========================================
- Hits         4846     4437     -409     
+ Misses        506      454      -52     

Files Changed	Coverage Δ
src/kwja/callbacks/word_module_writer.py	89.10% <ø> (ø)
src/kwja/utils/cohesion_analysis.py	86.27% <81.81%> (+1.70%)	⬆️
src/kwja/callbacks/utils.py	98.67% <100.00%> (+2.30%)	⬆️
src/kwja/datamodule/datasets/word.py	93.26% <100.00%> (+0.27%)	⬆️
src/kwja/datamodule/datasets/word_inference.py	96.00% <100.00%> (+0.71%)	⬆️
src/kwja/datamodule/examples/word.py	98.27% <100.00%> (+0.03%)	⬆️
src/kwja/metrics/word.py	99.00% <100.00%> (+0.68%)	⬆️
src/kwja/modules/word.py	99.33% <100.00%> (-0.01%)	⬇️