[DOP-21634] Make DBReader and DBWriter table name requirements less strict

[dolfinus]

Change Summary

DBReader(name=...) and DBWriter(name=...) validators are too strict, and don't allow passing table names with multiple dots. Fixed.

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 ✅

Project coverage is 91.85%. Comparing base (4b1cde7) to head (0dda590).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #318      +/-   ##
===========================================
+ Coverage    91.67%   91.85%   +0.17%     
===========================================
  Files          225      225              
  Lines         9649     9649              
  Branches       987      987              
===========================================
+ Hits          8846     8863      +17     
+ Misses         608      593      -15     
+ Partials       195      193       -2     

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