Rearrange expression namespaces

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues

Related PR

• Rearrange expression namespaces db#1052

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (0fc2b6c) to head (a17a523).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #398   +/-   ##
=========================================
  Coverage     98.73%   98.73%           
  Complexity      243      243           
=========================================
  Files            26       26           
  Lines           790      790           
=========================================
  Hits            780      780           
  Misses           10       10           

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