Refactor Command::insertWithReturningPks() method

[Tigrov]

Related PR

• Add upsertWithReturningPks() method db#973

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (faea3d9) to head (5092fe5).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #324      +/-   ##
============================================
+ Coverage     97.78%   97.80%   +0.01%     
- Complexity      227      229       +2     
============================================
  Files            22       22              
  Lines           769      774       +5     
============================================
+ Hits            752      757       +5     
  Misses           17       17              

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