[DOP-9787] Allow passing Decimal as input for ColumnIntHWM

[dolfinus]

Change Summary

Allow to pass Decimal and float input for ColumnIntHWM, but only if value does contain only 0 after decimal point - 1.000 is valid, 1.002 is not.

This allows to drop custom DecimalHWM class from onETL.

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

All modified and coverable lines are covered by tests ✅

Comparison is base (7a44f44) 95.56% compared to head (822cae5) 95.62%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #58      +/-   ##
===========================================
+ Coverage    95.56%   95.62%   +0.06%     
===========================================
  Files           48       48              
  Lines         1060     1075      +15     
  Branches       181      185       +4     
===========================================
+ Hits          1013     1028      +15     
  Misses          27       27              
  Partials        20       20              

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