update base_hwm_store config

[maxim-lixakov]

Change Summary

• restrict extra fields in BaseHWMStore and allow in BaseModel as classes Table, Process are inherited from BaseModel (as we keep compatibility)

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 #38 (1d109ee) into develop (f9a4435) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop      #38   +/-   ##
========================================
  Coverage    95.38%   95.39%           
========================================
  Files           48       48           
  Lines         1041     1042    +1     
  Branches       173      173           
========================================
+ Hits           993      994    +1     
  Misses          27       27           
  Partials        21       21           

Files	Coverage Δ
etl_entities/entity.py	96.42% <ø> (-0.13%)	⬇️
etl_entities/hwm_store/memory_hwm_store.py	94.11% <100.00%> (+0.78%)	⬆️