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 99.89%. Comparing base (b6ee95e) to head (6c5fe8b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #421   +/-   ##
=========================================
  Coverage     99.89%   99.89%           
  Complexity      296      296           
=========================================
  Files            33       33           
  Lines           930      930           
=========================================
  Hits            929      929           
  Misses            1        1           

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