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 98.39%. Comparing base (502d9f0) to head (72ef9e9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #369   +/-   ##
=========================================
  Coverage     98.39%   98.39%           
  Complexity      332      332           
=========================================
  Files            20       20           
  Lines          1057     1057           
=========================================
  Hits           1040     1040           
  Misses           17       17           

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