Add ExpressionBuilderInterface::build()

[samdark]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues	yiisoft/db#946

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (3a17c30) to head (c862f48).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #406   +/-   ##
=========================================
  Coverage     98.77%   98.77%           
  Complexity      229      229           
=========================================
  Files            18       18           
  Lines           733      733           
=========================================
  Hits            724      724           
  Misses            9        9           

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