update ColumnIntHWM

[maxim-lixakov]

Change Summary

• Change value type in ColumnIntHWM from StrictInt to int, validation for float values

will be added separately

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Merging #49 (5da8403) into develop (f4901df) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #49      +/-   ##
===========================================
- Coverage    95.43%   95.43%   -0.01%     
===========================================
  Files           48       48              
  Lines         1052     1051       -1     
  Branches       178      178              
===========================================
- Hits          1004     1003       -1     
  Misses          27       27              
  Partials        21       21              

Files	Coverage Δ
etl_entities/hwm/column/int_hwm.py	100.00% <100.00%> (ø)